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Georgios Grigoropoulos
Chair of Traffic Engineering and Control, Technical University of Munich (TUM), 80333 Munich, Germany

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Journal article
Published: 24 July 2021 in Sustainability
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Detailed specifications of urban traffic from different perspectives and scales are crucial for understanding and predicting traffic situations from the view of an autonomous vehicle (AV). We suggest a data-driven specification scheme for maneuvers at different design elements of the built infrastructure and focus on urban roundabouts in Germany. Based on real observations, we define classes of maneuvers, interactions and driving strategies for cyclists, pedestrians and motorized vehicles and define a matrix for merging different maneuvers, resulting in more complex interactions. The sequences of these interactions, which partially consist of explicit communications, are extracted from real observations and adapted into microscopic traffic flow simulations. The simulated maneuver sequences are then visualized in 3D environments and experienced by bicycle simulator test subjects. Using trajectory segments (in fictional space) from two conducted simulator studies, we relate the recorded movement patterns of test subjects with observed cyclists in reality.

ACS Style

Andreas Keler; Patrick Malcolm; Georgios Grigoropoulos; Seyed Hosseini; Heather Kaths; Fritz Busch; Klaus Bogenberger. Data-Driven Scenario Specification for AV–VRU Interactions at Urban Roundabouts. Sustainability 2021, 13, 8281 .

AMA Style

Andreas Keler, Patrick Malcolm, Georgios Grigoropoulos, Seyed Hosseini, Heather Kaths, Fritz Busch, Klaus Bogenberger. Data-Driven Scenario Specification for AV–VRU Interactions at Urban Roundabouts. Sustainability. 2021; 13 (15):8281.

Chicago/Turabian Style

Andreas Keler; Patrick Malcolm; Georgios Grigoropoulos; Seyed Hosseini; Heather Kaths; Fritz Busch; Klaus Bogenberger. 2021. "Data-Driven Scenario Specification for AV–VRU Interactions at Urban Roundabouts." Sustainability 13, no. 15: 8281.

Journal article
Published: 20 January 2021 in Sustainability
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The ongoing increase of bicycle traffic in urban areas forces transport authorities to reconsider the space allocation for different transport modes. Transport policies favor the introduction of high-quality bicycle infrastructure along urban corridors to improve the traffic quality and safety for bicyclists but more importantly to increase the attractiveness of bicycling and over vehicular modes. Especially in urban areas with an already established high and steadily increasing share of bicyclists, the introduction of bicycle highways is considered to further alleviate saturated interurban public transport and motor vehicle connections and increase the average traveled distance by non-motorized modes. Due to the expensive implementation costs and the space restrictions in already built-up urban environments, there should be an extensive planning phase for defining the expected changes in traffic efficiency and safety. However, the effects of urban bicycle highways on traffic performance metrics of bicyclists as well as other road users are not thoroughly studied. This paper aims to quantify and assess the potential effects of urban bicycle highway on road users. The study considers a possible inner-city pilot route in the city of Munich, where the present bicycle infrastructure is planned to be upgraded to a bicycle highway. A simulation model is designed using traffic data from field observations and future estimates for the traffic composition. Through microscopic traffic simulation, the potential effects of the introduced infrastructure on road users are determined for different study scenarios. Results show that traffic quality thresholds for bicycle highways, as defined in official guidelines, can only be fulfilled through the implementation of special bicycle traffic control measures such as bicycle coordination or bicycle passage time extension. Finally, unidirectional bicycle highways together with bicycle passage time extension provided the best overall traffic performance for bicycle traffic and motor vehicle traffic.

ACS Style

Georgios Grigoropoulos; Seyed Hosseini; Andreas Keler; Heather Kaths; Matthias Spangler; Fritz Busch; Klaus Bogenberger. Traffic Simulation Analysis of Bicycle Highways in Urban Areas. Sustainability 2021, 13, 1016 .

AMA Style

Georgios Grigoropoulos, Seyed Hosseini, Andreas Keler, Heather Kaths, Matthias Spangler, Fritz Busch, Klaus Bogenberger. Traffic Simulation Analysis of Bicycle Highways in Urban Areas. Sustainability. 2021; 13 (3):1016.

Chicago/Turabian Style

Georgios Grigoropoulos; Seyed Hosseini; Andreas Keler; Heather Kaths; Matthias Spangler; Fritz Busch; Klaus Bogenberger. 2021. "Traffic Simulation Analysis of Bicycle Highways in Urban Areas." Sustainability 13, no. 3: 1016.

Journal article
Published: 05 January 2021 in Sustainability
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This research addresses the phenomenon of varying bicycle friendliness in urban areas and considers which elements are necessary to design a city in a bike-friendly manner. It aims to provide a deeper understanding of the term bikeability, in relation to the established term walkability, and methods to create models that measure the degree of bikeability in urban areas. We explain different established models and compare their computational bases. The focus of this paper is to define a computational methodology built within a Geographic Information System (GIS) and a subsequent evaluation based on an investigation area in Munich, Germany. We introduce a bikeability index for specific investigation areas and geovisualize four selected factors of this index. The resulting map views show the road segments of the traffic network where the conditions for biking are adequate, but also those segments which need to be improved.

ACS Style

Jonas Schmid-Querg; Andreas Keler; Georgios Grigoropoulos. The Munich Bikeability Index: A Practical Approach for Measuring Urban Bikeability. Sustainability 2021, 13, 428 .

AMA Style

Jonas Schmid-Querg, Andreas Keler, Georgios Grigoropoulos. The Munich Bikeability Index: A Practical Approach for Measuring Urban Bikeability. Sustainability. 2021; 13 (1):428.

Chicago/Turabian Style

Jonas Schmid-Querg; Andreas Keler; Georgios Grigoropoulos. 2021. "The Munich Bikeability Index: A Practical Approach for Measuring Urban Bikeability." Sustainability 13, no. 1: 428.