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The European Union policy strategies on the sustainability of the transport system pursue the goals of maximizing safety and environmental benefits and reducing the severity and frequency of crashes, congestion, and pollutant emission rates. A common issue is the planning of the most effective solution for operational and safety management at intersections. In this study, an egg turbo roundabout is proposed as the alternative solution to a conventional roundabout in Southern Italy which suffers from traffic congestion. A comparative analysis is carried out using microsimulation techniques to investigate the safety effects and operational improvements of converting a traditional priority intersection into standard roundabout or turbo roundabout layout. In particular, the VISSIM software is used to explore the most relevant operational performance measures: queue length, travel times and delays. The lowest values of these measurements are recorded for the simulated turbo roundabout, thus making this scheme more appropriate in terms of operational performances. With regard to safety analysis, the Surrogate Safety Assessment Model (SSAM) is used to collect information on the predicted number of conflicts, the probability, and severity of the potential collisions. The results suggest that, for the specific case study, the safety levels of the standard roundabout and the turbo roundabout are approximately comparable.
Vincenzo Gallelli; Giusi Perri; Rosolino Vaiana. Operational and Safety Management at Intersections: Can the Turbo-Roundabout Be an Effective Alternative to Conventional Solutions? Sustainability 2021, 13, 5103 .
AMA StyleVincenzo Gallelli, Giusi Perri, Rosolino Vaiana. Operational and Safety Management at Intersections: Can the Turbo-Roundabout Be an Effective Alternative to Conventional Solutions? Sustainability. 2021; 13 (9):5103.
Chicago/Turabian StyleVincenzo Gallelli; Giusi Perri; Rosolino Vaiana. 2021. "Operational and Safety Management at Intersections: Can the Turbo-Roundabout Be an Effective Alternative to Conventional Solutions?" Sustainability 13, no. 9: 5103.
The European Union policy for road safety management is based on the European Directive 2019/1936/EC. Among the safety management procedures and strategies, road safety inspections (RSI) are an effective tool for preventing accident risk and reducing crash frequency and severity for existing road networks. The European Transport Safety Council encourages the extension of these measures to the main urban and rural roads by the 5th Road Safety Action Programme. In light of the above, in this study, a safety performance evaluation through the RSI approach is carried out for a high-risk rural road in Southern Italy in order to identify all the road infrastructure-related features with poor safety conditions. Afterwards, the relationship between infrastructure deficiencies and the frequency and severity of accidents is investigated; a significant relationship between accident density/total number of injured people and road markings gap is found. Furthermore, the results confirm that a high density of driveways strongly impacts crash frequency. The analysis of the contribution of multiple infrastructure-related variables on the crash occurrences is proposed by the identification of several mathematical models. A second-order AIC (Akaike’s information criterion) approach is carried out to compare the five fitted models investigated. Finally, a prediction calibrated model is proposed.
Rosolino Vaiana; Giusi Perri; Teresa Iuele; Vincenzo Gallelli. A Comprehensive Approach Combining Regulatory Procedures and Accident Data Analysis for Road Safety Management Based on the European Directive 2019/1936/EC. Safety 2021, 7, 6 .
AMA StyleRosolino Vaiana, Giusi Perri, Teresa Iuele, Vincenzo Gallelli. A Comprehensive Approach Combining Regulatory Procedures and Accident Data Analysis for Road Safety Management Based on the European Directive 2019/1936/EC. Safety. 2021; 7 (1):6.
Chicago/Turabian StyleRosolino Vaiana; Giusi Perri; Teresa Iuele; Vincenzo Gallelli. 2021. "A Comprehensive Approach Combining Regulatory Procedures and Accident Data Analysis for Road Safety Management Based on the European Directive 2019/1936/EC." Safety 7, no. 1: 6.
For asphalt concrete preparation in laboratory mix-design operations, bitumens are usually mixed with micrometer-sized particles (filler), sand and centimeter-sized crushed stones in a gyratory press at a temperature of about 140–155 °C depending on the bitumen viscosity, until adequate homogenization and compaction take place (air voids optimum). This requires energy consumption. To minimize it, the process needs to be optimized and is usually made empirically. The aim of this manuscript is to gain a comprehension of the physico-chemical mechanisms involved in the process by exploring: (i) the rheological properties (viscosity, activation energy) of a neat and RTFOT-aged bitumen, in presence and in absence of a filler, (ii) the volumetric and resistance behavior under the compaction in a standard Gyratory Compactor (GC) of their blends with aggregates and (iii) the mechanical properties (Indirect Tensile Strength, compression and tensile deformation) of the final products. Correlations between activation energy and pre-exponential factor of the viscosity on a side, and between viscosity, workability and final mechanical properties on the other side allowed to provide a rational interpretation of the physico-chemical processes involved in the framework of the physics of complex fluids. The scientific clues will be of help in optimizing the workability in asphalt concretes productions with obvious repercussions in terms of energy savings, useful for economic and environmental issues.
Paolino Caputo; Pietro Calandra; Rosolino Vaiana; Vincenzo Gallelli; Giovanni De Filpo; Cesare Oliviero Rossi. Preparation of Asphalt Concretes by Gyratory Compactor: A Case of Study with Rheological and Mechanical Aspects. Applied Sciences 2020, 10, 8567 .
AMA StylePaolino Caputo, Pietro Calandra, Rosolino Vaiana, Vincenzo Gallelli, Giovanni De Filpo, Cesare Oliviero Rossi. Preparation of Asphalt Concretes by Gyratory Compactor: A Case of Study with Rheological and Mechanical Aspects. Applied Sciences. 2020; 10 (23):8567.
Chicago/Turabian StylePaolino Caputo; Pietro Calandra; Rosolino Vaiana; Vincenzo Gallelli; Giovanni De Filpo; Cesare Oliviero Rossi. 2020. "Preparation of Asphalt Concretes by Gyratory Compactor: A Case of Study with Rheological and Mechanical Aspects." Applied Sciences 10, no. 23: 8567.
Steelmaking industries produce a large amount of solid wastes that need to be adequately managed in order to ensure environmental sustainability and reduce the impact of their disposal on earth pollution. Electric arc furnace (EAF) slags are those wastes deriving from secondary steelmaking production; these slags can be re-used and recycled in many industrial applications such as the production of asphalt mixes. In this paper authors investigate the surface performance of EAF slags used as second-hand aggregate in asphalt mixes. In particular, slags behavior under polishing is compared to other types of aggregate commonly used for asphalt concrete such as limestone, basalt, and kinginzite. Several devices (skid tester, laser profilometer, polishing machine) were used to collect experimental data; the analysis of microtexture was carried out by comparing aggregate surface performance before and after polishing. Results show that EAF slags are positively comparable to basalt as concerns the polishing behavior; good correlations between skid resistance and some microtexture indicators are also carried out.
Rosolino Vaiana; Filippo Balzano; Teresa Iuele; Vincenzo Gallelli. Microtexture Performance of EAF Slags Used as Aggregate in Asphalt Mixes: A Comparative Study with Surface Properties of Natural Stones. Applied Sciences 2019, 9, 3197 .
AMA StyleRosolino Vaiana, Filippo Balzano, Teresa Iuele, Vincenzo Gallelli. Microtexture Performance of EAF Slags Used as Aggregate in Asphalt Mixes: A Comparative Study with Surface Properties of Natural Stones. Applied Sciences. 2019; 9 (15):3197.
Chicago/Turabian StyleRosolino Vaiana; Filippo Balzano; Teresa Iuele; Vincenzo Gallelli. 2019. "Microtexture Performance of EAF Slags Used as Aggregate in Asphalt Mixes: A Comparative Study with Surface Properties of Natural Stones." Applied Sciences 9, no. 15: 3197.
ILT is particularly useful when the signal is characterized by multi-exponential decay, for example in spin relaxation or in the dephasing of the NMR spin echo signal associated with sopra molecular aggregation under the influence of pulsed magnetic or internal field gradients. As novel approach to observe the real rejuvenating effect of the potential additive, an Inverse Laplace Transform of the NMR spin-echo decay (T2) was applied. The potentialities of a new, non-toxic and eco-friendly biocompatible additive on aged bitumen are explored for the first time as bitumen rejuvenator, by means of advanced rheological and Relaxometry-NMR measurements. Pristine, aged, and doped aged bitumen morphology have been investigated by SEM. The new rejuvenator helps to rearrange the structure of the aged bitumen (aiming at the original one), and this mechanism can be observed by ILTNMR analysis.
Paolino Caputo; Valeria Loise; Saltanat Ashimova; Bagdat Teltayev; Rosolino Vaiana; Cesare Oliviero Rossi. Inverse Laplace Transform (ILT) NMR: A powerful tool to differentiate a real rejuvenator and a softener of aged bitumen. Colloids and Surfaces A: Physicochemical and Engineering Aspects 2019, 574, 154 -161.
AMA StylePaolino Caputo, Valeria Loise, Saltanat Ashimova, Bagdat Teltayev, Rosolino Vaiana, Cesare Oliviero Rossi. Inverse Laplace Transform (ILT) NMR: A powerful tool to differentiate a real rejuvenator and a softener of aged bitumen. Colloids and Surfaces A: Physicochemical and Engineering Aspects. 2019; 574 ():154-161.
Chicago/Turabian StylePaolino Caputo; Valeria Loise; Saltanat Ashimova; Bagdat Teltayev; Rosolino Vaiana; Cesare Oliviero Rossi. 2019. "Inverse Laplace Transform (ILT) NMR: A powerful tool to differentiate a real rejuvenator and a softener of aged bitumen." Colloids and Surfaces A: Physicochemical and Engineering Aspects 574, no. : 154-161.
In 2011, the United Nations Road Safety Collaboration (UNRSC) developed a Global Plan for the Decade of Action for Road Safety 2011–2020. Among the categories or “pillars” of activities, is the improvement of road safety for infrastructures. Furthermore, this plan is aligned by the UN Sustainable Development Goals that included even traffic safety. In this regard, this study estimates safety improvements achieved by converting a standard roundabout into an egg turbo roundabout. In particular, turbo roundabouts have become very popular in Northern Europe for both their safety and their capacity. Many studies have shown these advantages thanks to their features: preventive separation of entering flows, limited lane changing and low speeds due to curbs. Given the absence of existing turbo roundabouts in Italy, this research studied and compared a “virtual” roundabout with spiraling circular carriageways to an existing multi-lane roundabout in order to assess its significant reduction in terms of potential collisions. This study relied on traffic conflicts in micro-simulation by using VISSIM software and then Surrogate Safety Assessment Model (SSAM). The research is based on the traffic process observed at a standard roundabout in Cosenza (Italy) marked by a high level of congestion and safety problems. Speeds, critical gaps, queue lengths, and floating car data, obtained from video observations, have been used as input data for the calibration procedure of the first scenario (case study roundabout). Then, the turbo roundabout solution was built and simulated by using the previously derived parameters. Finally, the two roundabout scenarios were compared in terms of spatial distribution of the potential conflicts determined by SSAM. The results could help to measure the performance and safety impact of these two roundabout configurations.
Vincenzo Gallelli; Rosolino Vaiana. Safety Improvements by Converting a Standard Roundabout with Unbalanced Flow Distribution into an Egg Turbo Roundabout: Simulation Approach to a Case Study. Sustainability 2019, 11, 466 .
AMA StyleVincenzo Gallelli, Rosolino Vaiana. Safety Improvements by Converting a Standard Roundabout with Unbalanced Flow Distribution into an Egg Turbo Roundabout: Simulation Approach to a Case Study. Sustainability. 2019; 11 (2):466.
Chicago/Turabian StyleVincenzo Gallelli; Rosolino Vaiana. 2019. "Safety Improvements by Converting a Standard Roundabout with Unbalanced Flow Distribution into an Egg Turbo Roundabout: Simulation Approach to a Case Study." Sustainability 11, no. 2: 466.
A methodology for calibrating and validating VISSIM simulation model is presented that allows to replicate the observed vehicles conflicts. A roundabout case study has been selected to test the usefulness of a combined approach of VISSIM simulation package and the surrogate safety assessment model (SSAM) for providing reliable estimates of traffic conflicts. Safety performance has been assessed from the field by video-recording vehicle interactions at the roundabout, and then expressed in terms of time to collision (TTC) values. The proposed calibration procedure has been performed by a multistage methodology involving microscopic drivers’ car following behavior parameters to enhance the correlation between observed and simulated queue lengths at the roundabout’s entries. The calibration procedure is based on a statistical screening of inputs leading to a linear expression relating significant parameters to the queue length. The best estimates of the model’s parameters have been determined using a genetic algorithm technique. The spatial distribution of the rear-end conflicts and the TTC values determined by SSAM have been finally compared with the observed ones to analyze the capability of the model of replicating rear-end conflicts. The results suggest to this calibration procedure impacts positively on the estimate of the safety performance measures obtained through the simulation processes. Notwithstanding the good results in the evaluation of the model's accuracy, the simulation seems to fail in reproducing the traffic phenomena linked to unusual driving behavior, and therefore it is not able to replicate forced drivers’ maneuvers that can lead to a conflict situation.
Vincenzo Gallelli; Giuseppe Guido; Alessandro Vitale; Rosolino Vaiana. Effects of calibration process on the simulation of rear-end conflicts at roundabouts. Journal of Traffic and Transportation Engineering (English Edition) 2018, 6, 175 -184.
AMA StyleVincenzo Gallelli, Giuseppe Guido, Alessandro Vitale, Rosolino Vaiana. Effects of calibration process on the simulation of rear-end conflicts at roundabouts. Journal of Traffic and Transportation Engineering (English Edition). 2018; 6 (2):175-184.
Chicago/Turabian StyleVincenzo Gallelli; Giuseppe Guido; Alessandro Vitale; Rosolino Vaiana. 2018. "Effects of calibration process on the simulation of rear-end conflicts at roundabouts." Journal of Traffic and Transportation Engineering (English Edition) 6, no. 2: 175-184.
Macro-encapsulated phase change material (PCM) lightweight aggregates (ME-LWA) were produced and evaluated for their mechanical and thermal properties in road engineering applications. The ME-LWAs were first characterised in terms of their physical and geometrical properties. Then, the ME-LWAs were investigated in detail by applying the European Standards of testing for the Bulk Crushing Test and the Polished Stone Value (PSV) coefficient as well as Micro-Deval and laboratory profilometry. In addition, the thermal performance for possible construction of smart pavements with the inclusion of ME-LWAs for anti-ice purposes was determined. The crushing resistance of the ME-LWAs was improved, while their resistance to polishing was reduced. Thermal analysis of the encapsulated PCM determined it to possess excellent thermal stability and a heat storage capacity of 30.43 J/g. Based on the research findings, the inclusion of ME-LWAs in surface pavement layers could be considered a viable solution for the control of surface temperatures in cold climates. Road safety and maintenance could benefit in terms of reduced ice periods and reduced treatments with salts and other anti-ice solutions.
Xiangming Zhou; Gediminas Kastiukas; Claudio Lantieri; Piergiorgio Tataranni; Rosolino Vaiana; Cesare Sangiorgi. Mechanical and Thermal Performance of Macro-Encapsulated Phase Change Materials for Pavement Application. Materials 2018, 11, 1398 .
AMA StyleXiangming Zhou, Gediminas Kastiukas, Claudio Lantieri, Piergiorgio Tataranni, Rosolino Vaiana, Cesare Sangiorgi. Mechanical and Thermal Performance of Macro-Encapsulated Phase Change Materials for Pavement Application. Materials. 2018; 11 (8):1398.
Chicago/Turabian StyleXiangming Zhou; Gediminas Kastiukas; Claudio Lantieri; Piergiorgio Tataranni; Rosolino Vaiana; Cesare Sangiorgi. 2018. "Mechanical and Thermal Performance of Macro-Encapsulated Phase Change Materials for Pavement Application." Materials 11, no. 8: 1398.
Vincenzo Gallelli; Teresa Iuele; Rosolino Vaiana; Alessandro Vitale. Erratum to “Investigating the Transferability of Calibrated Microsimulation Parameters for Operational Performance Analysis in Roundabouts”. Journal of Advanced Transportation 2017, 2017, 1 -1.
AMA StyleVincenzo Gallelli, Teresa Iuele, Rosolino Vaiana, Alessandro Vitale. Erratum to “Investigating the Transferability of Calibrated Microsimulation Parameters for Operational Performance Analysis in Roundabouts”. Journal of Advanced Transportation. 2017; 2017 ():1-1.
Chicago/Turabian StyleVincenzo Gallelli; Teresa Iuele; Rosolino Vaiana; Alessandro Vitale. 2017. "Erratum to “Investigating the Transferability of Calibrated Microsimulation Parameters for Operational Performance Analysis in Roundabouts”." Journal of Advanced Transportation 2017, no. : 1-1.
Horizontal curves are identified as high-severity crash locations along different types of roads: driver deceleration and acceleration rates when approaching and departing horizontal curves play a key role in developing speed profiles. Drivers' behavior along curves is strictly related to the perception of the road geometry that, in turn, affects road safety. This article addresses an in depth-study on drivers' behavior along horizontal curves by monitoring vehicles speed through mobile devices equipped with a prototype mobile application. A sample of 35 participants was selected; overall 86 curves with different radius were investigated. Participants driving behavior was analyzed by deriving lateral accelerations from global positioning system (GPS) data. To assess how driving experience can affect the perception of the road geometry, expert drivers were involved in the experiments. Results show that the accumulated driving experience allows to adequately calibrate speed choices when approaching unsafe curves, having a better road geometry perception. Conversely, some drivers tend to overestimate their driving abilities; this lack of safety cognition may lead to erroneous speed estimations and to an unsafe driving behavior. Finally, this research shows that mobile devices (if adequately equipped and managed) may be used to enhance the awareness of drivers and promote traffic safety.
R. Vaiana; T. Iuele; V. Gallelli; D. Rogano. Demanded versus assumed friction along horizontal curves: An on-the-road experimental investigation. Journal of Transportation Safety & Security 2017, 10, 318 -344.
AMA StyleR. Vaiana, T. Iuele, V. Gallelli, D. Rogano. Demanded versus assumed friction along horizontal curves: An on-the-road experimental investigation. Journal of Transportation Safety & Security. 2017; 10 (4):318-344.
Chicago/Turabian StyleR. Vaiana; T. Iuele; V. Gallelli; D. Rogano. 2017. "Demanded versus assumed friction along horizontal curves: An on-the-road experimental investigation." Journal of Transportation Safety & Security 10, no. 4: 318-344.
Elisabeta I. Szerb; Isabella Nicotera; Bagdat Teltayev; Rosolino Vaiana; Cesare Oliviero Rossi. Highly stable surfactant-crumb rubber-modified bitumen: NMR and rheological investigation. Road Materials and Pavement Design 2017, 19, 1192 -1202.
AMA StyleElisabeta I. Szerb, Isabella Nicotera, Bagdat Teltayev, Rosolino Vaiana, Cesare Oliviero Rossi. Highly stable surfactant-crumb rubber-modified bitumen: NMR and rheological investigation. Road Materials and Pavement Design. 2017; 19 (5):1192-1202.
Chicago/Turabian StyleElisabeta I. Szerb; Isabella Nicotera; Bagdat Teltayev; Rosolino Vaiana; Cesare Oliviero Rossi. 2017. "Highly stable surfactant-crumb rubber-modified bitumen: NMR and rheological investigation." Road Materials and Pavement Design 19, no. 5: 1192-1202.
Microsimulation models are widespread for the analysis of roundabouts operational performance providing realistic modelling of vehicle movements. These models are based on many independent parameters to describe traffic and driver behaviour, which need to be calibrated in order to better match field data. In practice, despite the well-recognized importance of calibration and validation processes, simulation is conducted under default values because of difficulties in field data collection and deficiency in available guidelines. These issues can be faced by using transferability methodologies that allow applying the parameters calibrated for a case study to other similar locations. Therefore, this paper investigates the suitability of the transferability procedure adopting both the application-based and estimation-based approaches, by considering two roundabouts and a microsimulation tool. A Genetic Algorithm technique was used to determine the best estimates of these model parameters. After that, the authors compared field-measured with simulated queue lengths, considering four different scenarios. The results show that the application of Wiedemann 99 parameters calibrated for the first case study to the second one allows reducing the RMSNE more than 50%, thus confirming an acceptable level of transferability of these parameters between the two case studies. 1. Introduction and BackgroundIn the last few decades, simulation models have been widespread for transport system analysis and management, also in relation to traffic safety, and to evaluate a range of new ITS (Intelligent Transport System) applications [1]. In fact, simulation is less expensive, safer, and faster when compared with field implementation and testing [2]. In particular, as regards roundabout analysis, microsimulation models allow a dynamic approach to be used in order to predict intersection operational performance (capacity, levels of service, stop-line delay, etc.) and operating speed profiles [3]. Furthermore, they provide other advantages, such as realistic modelling of vehicle movements, also in relation to roundabout geometric features [4], the possibility of analysing queues spatial distributions, and more refined estimations of emissions and fuel consumption [5].Nowadays, many commercial microsimulation tools have been developed and become widespread. AIMSUN [6], VISSIM [7], and PARAMICS [8] are the most common of them, together with SimTraffic and Corsim.Microscopic simulation models are based on modelling of vehicle kinematics and interactions; movements are governed by gap acceptance, car following, lane-changing, and other models and are typically calculated for each vehicle at every specified time-step. In fact, they use an interval-based simulation to describe traffic operations [9].The usability of each tool in terms of both qualitative (applicability, ease, sensitivity to geometry, etc.) and quantitative aspects (measures of operational performance, such as delays, queue length, and capacity) has to be analysed in order to select the most adequate model for simulation [10].Microscopic simulation models are characterized by a flexible and user-definable methodology to evaluate traffic operations; moreover, the models are based on many independent parameters that are used to describe traffic flow and driver behaviour. Nevertheless, the default values provided for each parameter need to be changed by users in order to better match real field conditions through an adequate calibration and validation process [11, 12]. Using default calibration parameters, in fact, can produce unreliable simulation results. Both calibration and validation procedures enhance model accuracy, minimizing the discrepancy between model results and measurements or observations [13].As stated above, several software packages for simulating traffic have been developed and used to predict the actual operational performance of roundabouts. Therefore, a proper calibration of the simulation parameters is still a key issue which must be faced.In the study conducted by Gagnon et al. [14], the calibration potential of two analytical models (aaSIDRA and RODEL) and three microsimulation tools (PARAMICS, SimTraffic, and VISSIM) was investigated. In relation to the selected case studies (two modern roundabouts in New England), the authors found that VISSIM was the most versatile software for calibration purposes; on the contrary, RODEL seemed to be the least one and PARAMICS was quite insensitive to changes in input parameters for calibration. Results in terms of average delays also showed that, after calibration, the average percentage error was reduced from 52% to 13% and from 68% to 0.3% by using aaSIDRA and VISSIM models, respectively. Nevertheless, the authors highlighted that these findings were site specific and, therefore, the previous results needed to be validated on other similar test sites.Chen and Lee [15] investigated the accuracy of three software packages (RODEL, SIDRA, and VISSIM), which offer different calibration capabilities, in predicting multilane roundabout capacity and delays by making a comparison between uncalibrated results and field-measured data. As regards capacity estimates (at different circulating flow rates), results highlighted that RODEL slightly overestimated capacity at each entry, whereas SIDRA uncalibrated capacity was noticeably higher than collected field data for two of the three approaches. For the third approach, instead, results were closer to the measured data probably because this software performed better under high-demand conditions. Finally, VISSIM provided good capacity estimates.The importance of calibration in terms of comparability between field-measured data and simulated results was also highlighted by [16]. In this paper, the validation of the calibrated VISSIM model (by neural network approach) was performed on one-lane roundabouts and it was carried out in two steps. The first one, with a set of data collected at the same roundabout, is where the calibration was done; the second phase, instead, was performed on the measured data related to a second roundabout. Three traffic parameters such as traveling time, maximum queue length, and number of vehicles stopping at the entrance of the roundabout were investigated. The results of the first validation showed that the uncalibrated model provided a maximum queue length lower than the measured value of about 28%, whereas the calibration process allowed reduction of the percentage difference between the estimates of all parameters and the measured data to about 5%. The results of the second validation step showed that the model provided traveling time values similar to real data, whereas the estimates of the maximum queue length and the number of stopping were 26% greater and around 11% lower than the field measurements, respectively. The calibration procedure reduced these gaps to a difference between measured and simulated parameters lower than 7%.A trial and error approach for the calibration of two double lane roundabouts of different diameter was used in the research carried out by [17]. In this paper the difference between observed field data and simulated values for entry flows was expressed in terms of Mean Absolute Percentage Error (MAPE). The best configuration of the input parameter was selected and, for validating the model, measured speeds at the weaving section between leg 1 and leg 2 of both roundabouts were compared with the weaving speeds obtained from VISSIM. The MAPE values obtained from this comparison were found as 12.35 and 13.13 for the first and the second roundabout, respectively. Furthermore, a comparison between entry flows and circulating flows values obtained from VISSIM microsimulation and field data was carried out for both the roundabouts. Also, in this case, the results highlighted a strict correlation between estimates and real values. Finally, the authors investigated the capacity results, showing that simulated capacities were the closest to the observed ones if compared to the results obtained from the application of other methodologies (such as HCM and German models, IRC method, and TRRL regression method). Differences from a minimum of 7% to a maximum of 19% (according to the leg analysed of the roundabout) were found between VISSIM results and observed capacity values.Unfortunately, the calibration process is often neglected because of difficulties in field data collection, lack of sufficient data, and/or deficiency in available procedure guidelines [18]. These limitations can be avoided by transferring the parameters calibrated for a case study to other locations that are comparable in geometry and traffic conditions. However, the transferability of calibrated microsimulation parameters at different contexts must be investigated [19]. For this reason, recent researches have been oriented to the use of automatic calibration for traffic simulation models because of the increase in the number of parameters to manage. Therefore, the calibration process is considered as an optimization problem. For microscopic models, sensitivity analysis and a trial and error method can be used for automatic calibration, as shown in [2, 20]; however these two procedures are very time-consuming. Other studies, instead, focus on the calibration of input parameters by genetic algorithm (GA) [21], neural networks [16], or multistart algorithm [22].In this regard, the MULTITUDE [23] Project (Methods and tools for supporting the Use, caLibration, and validaTIon of Traffic simUlations moDEls), strongly supported by the European Commission through the Joint Research Centre, plays a key role. It was an Action (TU0903) supported by the EU COST office (European Cooperation in Science and Technology) and focused on the issue of uncertainty in traffic simulation and of calibration and validation as tools to manage it. In this document, the 4 Working Groups
Vincenzo Gallelli; Teresa Iuele; Rosolino Vaiana; Alessandro Vitale. Investigating the Transferability of Calibrated Microsimulation Parameters for Operational Performance Analysis in Roundabouts. Journal of Advanced Transportation 2017, 2017, 1 -10.
AMA StyleVincenzo Gallelli, Teresa Iuele, Rosolino Vaiana, Alessandro Vitale. Investigating the Transferability of Calibrated Microsimulation Parameters for Operational Performance Analysis in Roundabouts. Journal of Advanced Transportation. 2017; 2017 ():1-10.
Chicago/Turabian StyleVincenzo Gallelli; Teresa Iuele; Rosolino Vaiana; Alessandro Vitale. 2017. "Investigating the Transferability of Calibrated Microsimulation Parameters for Operational Performance Analysis in Roundabouts." Journal of Advanced Transportation 2017, no. : 1-10.
T. Iuele; Rosolino Vaiana; Vincenzo Gallelli; F. De Masi. The Influence of Aggregate Lithological Nature on Pavement Texture Polishing: A Comparative Investigation on a Test Site in Southern Italy. Advances in Civil Engineering Materials 2016, 5, 1 .
AMA StyleT. Iuele, Rosolino Vaiana, Vincenzo Gallelli, F. De Masi. The Influence of Aggregate Lithological Nature on Pavement Texture Polishing: A Comparative Investigation on a Test Site in Southern Italy. Advances in Civil Engineering Materials. 2016; 5 (1):1.
Chicago/Turabian StyleT. Iuele; Rosolino Vaiana; Vincenzo Gallelli; F. De Masi. 2016. "The Influence of Aggregate Lithological Nature on Pavement Texture Polishing: A Comparative Investigation on a Test Site in Southern Italy." Advances in Civil Engineering Materials 5, no. 1: 1.
In the last years, as regards the functional design of at-grade intersections, near to classic layouts (signal-controlled junctions, roundabouts, etc.) a new solution has born: the “turbo-roundabout”. It is a canalized multilane oval intersection with a non-traversable or partially traversable center island and with a spiral circulatory carriageway. This kind of roundabout is also characterized by a predictable lane use: some direction flows are physically separated by curbs. Several roundabouts with spiraling circular carriageways were built in northern Europe (in particular in Netherlands) and they have further allowed to extend the notable advantages of this functional solution against multilane roundabouts, such as: 1) no lane changing on the circulatory carriageway; 2) no need to yield to traffic flow on more than two lanes; 3) low driving speed along the through movement because of raised lane dividers and, consequently, a high reduction of accident risk. In this paper a careful literature review on turbo-roundabouts is proposed. Furthermore, the Authors examine the potentialities offered by the transformation of an existing semi-two lanes roundabout into a “virtual” configuration of a turbo-roundabout. In particular, they also evaluate and compare the performance parameters in the two configurations by using a microsimulation software. The case study roundabout is placed in the city of Cosenza (Southern Italy) and it is characterized by great problems of congestion during peak hours. Experimental measures of traffic flows (O/D matrixes), critical gaps, queue lengths and approaching and circulating speeds represent input data for calibration procedures. Afterwards, derived calibration parameters are used as input variables for the new configuration of the intersection as a turbo roundabout. The Authors highlight that the conversion of the existing roundabout into a virtual turbo roundabout determine an increase of capacity together with a minimization of the queue lengths.
Vincenzo Gallelli; Teresa Iuele; Rosolino Vaiana. Conversion of a Semi-two Lanes Roundabout into a Turbo-roundabout: A Performance Comparison. Procedia Computer Science 2016, 83, 393 -400.
AMA StyleVincenzo Gallelli, Teresa Iuele, Rosolino Vaiana. Conversion of a Semi-two Lanes Roundabout into a Turbo-roundabout: A Performance Comparison. Procedia Computer Science. 2016; 83 ():393-400.
Chicago/Turabian StyleVincenzo Gallelli; Teresa Iuele; Rosolino Vaiana. 2016. "Conversion of a Semi-two Lanes Roundabout into a Turbo-roundabout: A Performance Comparison." Procedia Computer Science 83, no. : 393-400.
Safety, skid resistance and noise of roads highly depend on the characteristics of pavement surface texture, for both porous and dense-graded wearing courses. In the light of the above facts, the objective of the study was to model the relationship between laser-based and volumetric-type measurements of the surface macro-texture of a pavement. In more detail, the study focused on the mean profile depth (MPD, as per ISO 13473-1:1997 and ASTM E1845-01) and on the mean texture depth (MTD, as known as sand patch texture, as per ASTM E965-96 and EN 13036-1). Different types of surface textures were considered: dense-graded friction courses (DGFC), splittmastic asphalts (SMA), open-graded friction courses (OGFC), porous European mixes (PEM). A generalised simple model has been set up, calibrated and validated. The proposed model fits the data of many types of wearing courses without neglecting the basic achievements which refer to the curves previously derived.
F.G. Praticò; R. Vaiana. A study on the relationship between mean texture depth and mean profile depth of asphalt pavements. Construction and Building Materials 2015, 101, 72 -79.
AMA StyleF.G. Praticò, R. Vaiana. A study on the relationship between mean texture depth and mean profile depth of asphalt pavements. Construction and Building Materials. 2015; 101 ():72-79.
Chicago/Turabian StyleF.G. Praticò; R. Vaiana. 2015. "A study on the relationship between mean texture depth and mean profile depth of asphalt pavements." Construction and Building Materials 101, no. : 72-79.
Filippo G. Praticò; Rosolino Vaiana; Teresa Iuele. Macrotexture modeling and experimental validation for pavement surface treatments. Construction and Building Materials 2015, 95, 658 -666.
AMA StyleFilippo G. Praticò, Rosolino Vaiana, Teresa Iuele. Macrotexture modeling and experimental validation for pavement surface treatments. Construction and Building Materials. 2015; 95 ():658-666.
Chicago/Turabian StyleFilippo G. Praticò; Rosolino Vaiana; Teresa Iuele. 2015. "Macrotexture modeling and experimental validation for pavement surface treatments." Construction and Building Materials 95, no. : 658-666.
Filippo Giammaria Praticò; Rosolino Vaiana; Teresa Iuele. Surface Performance Characterization of Single-Layer Surface Dressing: A Macrotexture Prediction Model. RILEM Bookseries 2015, 11, 459 -470.
AMA StyleFilippo Giammaria Praticò, Rosolino Vaiana, Teresa Iuele. Surface Performance Characterization of Single-Layer Surface Dressing: A Macrotexture Prediction Model. RILEM Bookseries. 2015; 11 ():459-470.
Chicago/Turabian StyleFilippo Giammaria Praticò; Rosolino Vaiana; Teresa Iuele. 2015. "Surface Performance Characterization of Single-Layer Surface Dressing: A Macrotexture Prediction Model." RILEM Bookseries 11, no. : 459-470.
Filippo Giammaria Praticò; Rosolino Vaiana; Teresa Iuele. Experimental Investigation on Surface Performance and Acoustic Absorption. RILEM Bookseries 2015, 11, 435 -446.
AMA StyleFilippo Giammaria Praticò, Rosolino Vaiana, Teresa Iuele. Experimental Investigation on Surface Performance and Acoustic Absorption. RILEM Bookseries. 2015; 11 ():435-446.
Chicago/Turabian StyleFilippo Giammaria Praticò; Rosolino Vaiana; Teresa Iuele. 2015. "Experimental Investigation on Surface Performance and Acoustic Absorption." RILEM Bookseries 11, no. : 435-446.
The recycling of reclaimed asphalt pavement (RAP) in hot-mix asphalt (HMA) is an important opportunity in regard to transportation infrastructure construction and maintenance because it helps to achieve more sustainable road transport systems (reduction of waste production and reduction of resource consumption). In particular, totally recycled HMAs can be a good alternative for road paving even if performance can be an issue. As is well known, the type of low-volume road pavement (gravel, coarse rocky soil, crushed aggregate, cobblestone, concrete block, or some type of bituminous seal coat or asphalt pavement) depends on traffic volume, native in-place soils, and the need to control surface and depth erosion. The objectives and scope of this research were confined to the formalization of strategies and technical procedures for recycling RAP from porous asphalt concretes to obtain permeable wearing courses for low-volume roads. Different solutions were investigated. High percentages of RAP were used in the recycling process, and traditional and advanced tests on RAP and recycled mixes were carried out. RAP variability was examined, and a method for facing its consequences was proposed. Mechanical performance was adequate. Recycling porous European mixes could be a proper way to achieve environmental sustainability in pavement construction, as the functional performance results are very promising and encouraging. Practical applications and perspectives in rehabilitation, maintenance, and research are outlined.
Filippo Giammaria Praticò; Rosolino Vaiana; Teresa Iuele. Permeable Wearing Courses from Recycling Reclaimed Asphalt Pavement for Low-Volume Roads. Transportation Research Record: Journal of the Transportation Research Board 2015, 2474, 65 -72.
AMA StyleFilippo Giammaria Praticò, Rosolino Vaiana, Teresa Iuele. Permeable Wearing Courses from Recycling Reclaimed Asphalt Pavement for Low-Volume Roads. Transportation Research Record: Journal of the Transportation Research Board. 2015; 2474 (1):65-72.
Chicago/Turabian StyleFilippo Giammaria Praticò; Rosolino Vaiana; Teresa Iuele. 2015. "Permeable Wearing Courses from Recycling Reclaimed Asphalt Pavement for Low-Volume Roads." Transportation Research Record: Journal of the Transportation Research Board 2474, no. 1: 65-72.
The objective of this paper is to study the variability of on-site acoustic measurements in non-normal conditions, as a function of the angle. A porous European mix was investigated. In order to reject the hypothesis that the cause of the variations in the acoustic properties is the surface inhomogeneity, texture properties were investigated according to the standard ISO 13473-1 and ISO/CD TS 13473-4. The acoustic absorption coefficient was measured according to ISO 13472-1. Results were compared and analysed in terms of averages and standard deviations. Result analyses may allow us to derive how absorption properties may vary as a function of the angle of incidence (under the hypothesis of homogeneous surface texture of the friction course). A tentative theoretical framework for explaining the dependence of acoustic absorption on incidence angle was formulated. The outcomes of this study are expected to benefit both practitioners and researchers.
Filippo Pratico; Rosolino Vaiana; R. Fedele. A study on the dependence of PEMs acoustic properties on incidence angle. International Journal of Pavement Engineering 2014, 16, 632 -645.
AMA StyleFilippo Pratico, Rosolino Vaiana, R. Fedele. A study on the dependence of PEMs acoustic properties on incidence angle. International Journal of Pavement Engineering. 2014; 16 (7):632-645.
Chicago/Turabian StyleFilippo Pratico; Rosolino Vaiana; R. Fedele. 2014. "A study on the dependence of PEMs acoustic properties on incidence angle." International Journal of Pavement Engineering 16, no. 7: 632-645.