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Prof. Khaled Al-Sahili
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0 Traffic and Transportation
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Career Timeline

An=Najah National University, Dean of Faculty of Engineering and Information Technology

Institute, Department or Faculty Head

01 August 2014 - 01 August 2019


An=Najah National University

Research Director

01 August 2000 - 01 September 2014


An=Najah National University

University Educator/Researcher

01 August 1999 - 30 August 2021




Short Biography

Associate Professor of Civil Engineering with wide experience in transportation system engineering and planning, and strategic development planning. Occupied the positions of Director of the Construction and Transportation Research Center for 14 years and the Dean of the Faculty of Engineering and Information Technology at An-Najah National University for 5 years.

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Research article
Published: 27 March 2021 in International Journal of Photoenergy
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In this research, a novel design and operation of solar-based charging system for battery vehicle for a 50 km run is proposed. The proposal is aimed at replacing 110 existing diesel vehicles with 39 electric buses. Several operation scenarios for the charging stations are proposed and analyzed. Scenarios include two different battery charging methodologies and one hybrid option between electric buses and diesel vehicles. An energy model of the adapted electric buses is developed first. After that, load demand and needs including number of daily trips, number of passengers per hour, and hourly energy consumption are determined based on the developed model and gathered information. Results show that a 5.7 MWp photovoltaic system is required to power this transportation line with a loss of load probability of 5% and a trip cost per passenger of 2.05 USD. The simple payback period of the system is found to be 10 years, which is 40% of the system’s lifetime. The amount of CO2 mitigated by the proposed system is estimated as 1,629,387 (kg/year). The social impact of the proposed project is found acceptable; whereas, most of the current employees will keep their jobs with higher salaries by about 145% and less working hours by 50%. Moreover, it is expected that the proposed project will significantly increase the reliability, convenience, and sustainability of the transportation process.

ACS Style

Mohamed Salameh; Tamer Khatib; Khaled Alsahili. A Novel Design of Photovoltaic-Based Charging Station for Battery Vehicles with Dynamic Demand: A Case of Short Runs. International Journal of Photoenergy 2021, 2021, 1 -17.

AMA Style

Mohamed Salameh, Tamer Khatib, Khaled Alsahili. A Novel Design of Photovoltaic-Based Charging Station for Battery Vehicles with Dynamic Demand: A Case of Short Runs. International Journal of Photoenergy. 2021; 2021 ():1-17.

Chicago/Turabian Style

Mohamed Salameh; Tamer Khatib; Khaled Alsahili. 2021. "A Novel Design of Photovoltaic-Based Charging Station for Battery Vehicles with Dynamic Demand: A Case of Short Runs." International Journal of Photoenergy 2021, no. : 1-17.

Journal article
Published: 11 March 2021 in Sustainability
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Universities play an essential role in spreading climate change awareness. However, slight information on climate change and environmental issues had been integrated into the curricula. Moreover, minimal research had been carried out to understand university role in spreading awareness, and students level of awareness and daily behaviour towards climate change, especially in developing countries. This paper aims to investigate the aforementioned issues. An experimental study was carried out on 448 undergraduate students enrolled at An-Najah National University Palestine. The study aimed to examine students’ knowledge and daily behaviour towards climate change, and the important role the university and students’ societies play in terms of spreading and enhancing awareness. The results revealed that female and male students had a non satisfactory interest level in environmental topics and activities, and gender equality did not seem to be an issue. Moreover, female students tend to have a significantly lower level of awareness on climate change compared to male students. On the other hand, being an engineering students or a member in students’ societies had a positive impact on students’ level of awareness and especially females. The results revealed that female students who are enrolled in the engineering faculty or members of students’ societies had a significantly higher level of awareness compared to female students who are enrolled in other faculties or not members of students’ societies. In general, students had a low level of awareness regardless of gender or faculty and universities should offer undergraduate students and especially female students’ opportunities to learn more about climate change by integrating climate change topics into higher education. Moreover, universities should support extracurricular activities held by student societies, and some of these activities should be directed towards environmental and climate change issues. This study entails the activities of the Mediterranean Gender Equality Community of Practice co-created by the Mediterranean Network of Engineering Schools (RMEI), where An-Najah University is an active member, with the support of the EU TARGET project entitled ’Taking a reflexive approach to gender equality at Institutional transformation’.

ACS Style

Mona Demaidi; Khaled Al-Sahili. Integrating SDGs in Higher Education—Case of Climate Change Awareness and Gender Equality in a Developing Country According to RMEI-TARGET Strategy. Sustainability 2021, 13, 3101 .

AMA Style

Mona Demaidi, Khaled Al-Sahili. Integrating SDGs in Higher Education—Case of Climate Change Awareness and Gender Equality in a Developing Country According to RMEI-TARGET Strategy. Sustainability. 2021; 13 (6):3101.

Chicago/Turabian Style

Mona Demaidi; Khaled Al-Sahili. 2021. "Integrating SDGs in Higher Education—Case of Climate Change Awareness and Gender Equality in a Developing Country According to RMEI-TARGET Strategy." Sustainability 13, no. 6: 3101.

Journal article
Published: 05 February 2021 in Proceedings of the Institution of Civil Engineers - Transport
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The increasing interest in sustainable development has underlined the importance of accessibility as a key indicator to assess Public Transport (PT) investments. In several developing countries, measuring PT accessibility has been limited although technical tools are available. This study outlines a proposed methodology for assessing accessibility of an intra-city fixed route PT service with its application in Nablus City, Palestine. The primary objective is to develop a Local Index of Public Transport Availability (LIPTA) to reflect availability levels of PT services on a zonal scale. The methodology adopts analytical methods using the collective data and the field survey of PT frequency and characteristics. This study consolidates several studies and integrates the spatial and temporal components to produce a collective PT accessibility measure. The results of this study showed that LIPTA provides a suitable methodology to measure and assess PT accessibility for urban areas. Its application showed Nablus City zones with their various levels of PT accessibility ranging from excellent to poor. It also forms a guide for transport planners and decision makers on where and how to improve the PT services and coverage.

ACS Style

Khaled Al-Sahili; Khalil Qaisi. A methodology for measuring a local index of public transport accessibility. Proceedings of the Institution of Civil Engineers - Transport 2021, 1 -12.

AMA Style

Khaled Al-Sahili, Khalil Qaisi. A methodology for measuring a local index of public transport accessibility. Proceedings of the Institution of Civil Engineers - Transport. 2021; ():1-12.

Chicago/Turabian Style

Khaled Al-Sahili; Khalil Qaisi. 2021. "A methodology for measuring a local index of public transport accessibility." Proceedings of the Institution of Civil Engineers - Transport , no. : 1-12.

Research article
Published: 29 December 2020 in Advances in Civil Engineering
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Road crashes are problems facing the transportation sector. Crash data in many countries are available only for the past 10 to 20 years, which makes it difficult to determine whether the data are sufficient to establish reasonable and accurate prediction rates. In this study, the effect of sample size (number of years used to develop a prediction model) on the crash prediction accuracy using Autoregressive integrated moving average (ARIMA) method was investigated using crash data for years 1971–2015. Based on the availability of annual crash records, road crash data for four selected countries (Denmark, Turkey, Germany, and Israel) were used to develop the crash prediction models based on different sample sizes (45, 35, 25, and 15 years). Then, crash data for 2016 and 2017 were used to verify the accuracy of the developed models. Furthermore, crash data for Palestine were used to test the validity of the results. The used data included fatality, injury, and property damage crashes. The results showed similar trends in the models’ prediction accuracy for all four countries when predicting road crashes for year 2016. Decreasing the sample sizes led to less prediction accuracy up to a sample size of 25; then, the accuracy increased for the 15-year sample size. Whereas there was no specific trend in the prediction accuracy for year 2017, a higher range of prediction error was also obtained. It is concluded that the prediction accuracy would vary based on the varying socioeconomic, traffic safety programs and development conditions of the country over the study years. For countries with steady and stable conditions, modeling using larger sample sizes would yield higher accuracy models with higher prediction capabilities. As for countries with less steady and stable conditions, modeling using smaller sample sizes (15 years, for example) would lead to high accuracy models with good prediction capabilities. Therefore, it is recommended that the socioeconomic and traffic safety program status of the country is considered before selecting the practical minimum sample size that would give an acceptable prediction accuracy, therefore saving efforts and time spent in collecting data (more is not always better). Moreover, based on the data analysis results, long-term ARIMA prediction models should be used with caution.

ACS Style

Fady M. A. Hassouna; Khaled Al-Sahili. Practical Minimum Sample Size for Road Crash Time-Series Prediction Models. Advances in Civil Engineering 2020, 2020, 1 -12.

AMA Style

Fady M. A. Hassouna, Khaled Al-Sahili. Practical Minimum Sample Size for Road Crash Time-Series Prediction Models. Advances in Civil Engineering. 2020; 2020 ():1-12.

Chicago/Turabian Style

Fady M. A. Hassouna; Khaled Al-Sahili. 2020. "Practical Minimum Sample Size for Road Crash Time-Series Prediction Models." Advances in Civil Engineering 2020, no. : 1-12.

Journal article
Published: 23 September 2020 in Sustainability
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During the last two decades, the development of sustainable transportation systems has been highlighted as a key element in solving environmental problems related to climate change and impacts on greenhouse gases. Globally, the transportation sector has become one of the main contributors to these environmental problems. Thus, the environmental impact assessment of this sector and the implications of new vehicle technologies have begun to be considered as first steps for any long-term future strategies in this sector. In Palestine, the lack of environmental data related to the transportation sector and the absence of studies that address the new vehicle technologies (such as hybrid vehicles) and their future implications make it difficult to set up any future strategies or plans. In this study, the current and the future environmental impacts of the transportation sector have been assessed, and the future implications of hybrid vehicles have been determined. The gross domestic product (GDP), population, and the number of vehicles for the period 1994–2018 have been used to develop an auto regressive integrated moving average (ARIMA) prediction model for the future number of vehicles. Then, the total traveled kilometers and the total consumed fuels (by diesel and gasoline vehicles) have been predicted. After that, the current and future (2020 and 2030) greenhouse gas (GHG) emissions, including CO2, N2O, and CH4, have been estimated. Finally, the future implications of hybrid vehicles, based on two scenarios (10% and 20% hybrid vehicles) have been estimated. The results have showed that the estimated CO2, N2O, and CH4 emissions from the transportation sector in 2020 are 4,842,164.5, 213.8, and 445.8 tons, which are very high, and even much higher than the total national emissions of 2014 (the only officially available data). Moreover, in 2030, replacing 20% of internal combustion engine vehicles (ICEVs) by hybrid vehicles would lead to 4.66% and 13.31% reductions in CO2 and N2O, respectively, as compared to 100% ICEVs, while the CH4 emissions will increase. However, the overall CO2-equivalent will decrease by 5%; therefore, a more sustainable transport system will be achieved.

ACS Style

Fady Hassouna; Khaled Al-Sahili. Environmental Impact Assessment of the Transportation Sector and Hybrid Vehicle Implications in Palestine. Sustainability 2020, 12, 7878 .

AMA Style

Fady Hassouna, Khaled Al-Sahili. Environmental Impact Assessment of the Transportation Sector and Hybrid Vehicle Implications in Palestine. Sustainability. 2020; 12 (19):7878.

Chicago/Turabian Style

Fady Hassouna; Khaled Al-Sahili. 2020. "Environmental Impact Assessment of the Transportation Sector and Hybrid Vehicle Implications in Palestine." Sustainability 12, no. 19: 7878.

Research article civil engineering
Published: 18 July 2020 in Arabian Journal for Science and Engineering
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This paper presents an analysis of road traffic crashes in Palestine. Over the period of the past 5 decades, there have been uncommon and sever changes in the annual number of road traffic crashes. Such changes can be contributed to varying socioeconomic and political changes. Relevant data have been collected despite the difficulties in obtaining such data from different authorities for various time stages. After examining the collected data, a time series model is developed considering ARIMA methodologies to come up with a model that explains the changes in road traffic crashes during the period since the establishment of the Palestinian National Authority in 1994. Proper model verification is done for the developed model and shows a limited difference of 6.1% between the observed and the forecasted traffic crashes for 2017. According to the developed model, a generally increasing trend is observed, which is expected to continue in the future, and consequently, there will be a vital need to improve traffic safety conditions and develop a national traffic safety program in Palestine.

ACS Style

Fady M. A. Hassouna; Sameer Abu-Eisheh; Khaled Al-Sahili. Analysis and Modeling of Road Crash Trends in Palestine. Arabian Journal for Science and Engineering 2020, 45, 1 -13.

AMA Style

Fady M. A. Hassouna, Sameer Abu-Eisheh, Khaled Al-Sahili. Analysis and Modeling of Road Crash Trends in Palestine. Arabian Journal for Science and Engineering. 2020; 45 (10):1-13.

Chicago/Turabian Style

Fady M. A. Hassouna; Sameer Abu-Eisheh; Khaled Al-Sahili. 2020. "Analysis and Modeling of Road Crash Trends in Palestine." Arabian Journal for Science and Engineering 45, no. 10: 1-13.

Journal article
Published: 08 July 2020 in Sustainability
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During the last two decades, problems related to high-energy consumption and greenhouse gas (GHG) emissions by the transportation sector have arisen. Therefore, several alternatives have been investigated, in order to reduce the dependence on the conventional fuels that are used by land transportation modes. One of these promising alternatives is the electric vehicles (EVs), which seem to be the future replacement for conventional vehicles. Thus, this study aims to quantify the energy and the environmental implications of EVs in Palestine in 2030, considering that the current percentage of EVs is almost 0%. In this study, the needed parameters related to the number of vehicles and energy costs by source in Palestine were collected. Then, several prediction models have been developed in order to determine the energy and environmental implications of EVs in 2030, considering that 10% of conventional vehicles could be replaced by EV during the next 10 years (2020–2030). The results have showed that this could save USD 464.31 million in operating energy costs during 2030 (one year of saving). More specifically, this number is almost equal to 3.18% of the gross domestic product (GDP) of Palestine in 2018. Furthermore, significant amounts of GHG emissions could be reduced. The reduction (during 2030) in NH4, N2O, and CO2 emissions could be around 10.51%, 10%, and 6.86%, respectively.

ACS Style

Fady Hassouna; Khaled Al-Sahili. Future Energy and Environmental Implications of Electric Vehicles in Palestine. Sustainability 2020, 12, 5515 .

AMA Style

Fady Hassouna, Khaled Al-Sahili. Future Energy and Environmental Implications of Electric Vehicles in Palestine. Sustainability. 2020; 12 (14):5515.

Chicago/Turabian Style

Fady Hassouna; Khaled Al-Sahili. 2020. "Future Energy and Environmental Implications of Electric Vehicles in Palestine." Sustainability 12, no. 14: 5515.

Research article civil engineering
Published: 31 October 2018 in Arabian Journal for Science and Engineering
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This study investigates the effect of geometric design consistency on road safety in the West Bank. Studies have shown that operating speed, vehicle stability, alignment indices, and driver’s workload are the common consistency measures that might affect safety. A total of 118-km two-lane rural highways in the West Bank, Palestine, were studied based on limitations of available data. Comprehensive geometric and operating data for the selected highways obtained from field survey, maps, and official sources were used to investigate the effect of design consistency measures on road safety. Crashes for years 2008–2012, totaling 263, were used for model development using the generalized linear regression approach. Tested models were statistically significant at 95%, and adopted models showed acceptable levels of goodness of fit. The recommended model performed well across additional highway sections, additional years of data, validation of algorithm, and “%error” with a high linear correlation. The study adds to the evidence that several geometric design consistency measures contribute to roadway safety. The significant measures for the two-lane rural highways in the West Bank were segment length, traffic volume, difference between operating and design speeds, absolute difference in the 85th percentile speeds between successive design elements, and the ratio of individual curve radius to the average radius. The practical implication of this study, in addition to being able to predict crashes based on the recommended measures, highway designers should pay careful attention to inconsistent designs of two-lane rural highways to reduce their crash frequency.

ACS Style

Khaled Al-Sahili; Mohammed Dwaikat. Modeling Geometric Design Consistency and Road Safety for Two-Lane Rural Highways in the West Bank, Palestine. Arabian Journal for Science and Engineering 2018, 44, 4895 -4909.

AMA Style

Khaled Al-Sahili, Mohammed Dwaikat. Modeling Geometric Design Consistency and Road Safety for Two-Lane Rural Highways in the West Bank, Palestine. Arabian Journal for Science and Engineering. 2018; 44 (5):4895-4909.

Chicago/Turabian Style

Khaled Al-Sahili; Mohammed Dwaikat. 2018. "Modeling Geometric Design Consistency and Road Safety for Two-Lane Rural Highways in the West Bank, Palestine." Arabian Journal for Science and Engineering 44, no. 5: 4895-4909.

Research article civil engineering
Published: 27 April 2018 in Arabian Journal for Science and Engineering
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Crash prediction models (CPMs) are important tools to predict the safety performance of highways based on their operational and geometric characteristics. Most of these models use geometric design characteristics to predict the number of crashes. However, few studies have identified the effectiveness of geometric design consistency measures in explaining crash occurrence probability and crash prediction. Crash prediction models that incorporate design consistency measures for rural two-lane, two-way roadways in the West Bank of Palestine have been developed. This study compares the effectiveness of the resulting models with those which rely on geometric design characteristics only. Approximately 118 km length of two-lane rural highways in the West Bank was selected covering a variety of highway classifications, locations, and characteristics. Different design consistency measures were considered in the developed CPM. The generalized linear regression modeling approach was used, and different mathematical forms were tested. The research presents a quantitative comparison between CPMs that explicitly consider design consistency with the Highway Safety Manual models, which use geometric design characteristics. The study proposes an approach to identify geometrically inconsistent locations using the safety-consistency factor. The results indicate that geometric consistency measures could provide more reliable crash prediction models, thus predicting collision potential more accurately.

ACS Style

Khaled Al-Sahili; Mohammed Dwaikat; Sameer Abu-Eisheh; Wael Alhajyaseen. Effectiveness of Consistency Measures in Crash Prediction Models for Two-Lane Highways in Palestine. Arabian Journal for Science and Engineering 2018, 43, 5645 -5656.

AMA Style

Khaled Al-Sahili, Mohammed Dwaikat, Sameer Abu-Eisheh, Wael Alhajyaseen. Effectiveness of Consistency Measures in Crash Prediction Models for Two-Lane Highways in Palestine. Arabian Journal for Science and Engineering. 2018; 43 (10):5645-5656.

Chicago/Turabian Style

Khaled Al-Sahili; Mohammed Dwaikat; Sameer Abu-Eisheh; Wael Alhajyaseen. 2018. "Effectiveness of Consistency Measures in Crash Prediction Models for Two-Lane Highways in Palestine." Arabian Journal for Science and Engineering 43, no. 10: 5645-5656.

Journal article
Published: 01 September 2016 in Transportation Research Part A: Policy and Practice
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Estimating parking demand in Palestine requires more oriented studies towards parking generation to enrich transportation planning, design, and management. Using regional or international models and rates of parking demand may not be appropriate for Palestine. This research is conducted to establish a reference for provision of parking supply for three major types of land uses, which are residential, office, and retail.Seventy-three sites of different land uses were selected through field investigations, interviews, and availability of information for each site. The study covered all main cities in the West Bank, Palestine. Data collection was conducted manually, which contains site characteristics and average of two-day parking counts during three periods (AM, PM, and Peak of the Development).Numerous models and rates were investigated yielding variable statistical accuracies. Most appropriate statistical models/rates were summarized and highlighted for each type of land use, and parking generation models with acceptable statistical significance were recommended, otherwise, parking generation rates were recommended. Simple linear regression, natural logarithmic linear regression, and power were the forms of the recommended models for the studied land uses.This study forms the first step of a future Palestinian “Parking Generation Manual” that should contain various local land use types.

ACS Style

Khaled Al-Sahili; Jamil Hamadneh. Establishing parking generation rates/models of selected land uses for Palestinian cities. Transportation Research Part A: Policy and Practice 2016, 91, 213 -222.

AMA Style

Khaled Al-Sahili, Jamil Hamadneh. Establishing parking generation rates/models of selected land uses for Palestinian cities. Transportation Research Part A: Policy and Practice. 2016; 91 ():213-222.

Chicago/Turabian Style

Khaled Al-Sahili; Jamil Hamadneh. 2016. "Establishing parking generation rates/models of selected land uses for Palestinian cities." Transportation Research Part A: Policy and Practice 91, no. : 213-222.