Determination of the duration of vehicle delay before unsignalized pedestrian crosswalks
Students Name: Shvets Vadym Viktorovych
Qualification Level: magister
Speciality: Traffic Control and Organization
Institute: Institute of Mechanical Engineering and Transport
Mode of Study: full
Academic Year: 2020-2021 н.р.
Language of Defence: ukrainian
Abstract: Shvets V.V, Barvinska Kh.A. (supervisor). Determination of the duration of vehicle delay before unsignalized pedestrian crosswalks. Master’s thesis. - Lviv Polytechnic National University, Lviv, 2020. Extended abstract. When conducting research on highways, it is necessary to obtain information about the indicators of the study area. The list of required indicators to assess the condition of the study area includes: traffic organization at the study site, traffic intensity, capacity, as well as such an important indicator as vehicle delays at intersections and pedestrian crossings [1-3]. Delay of vehicles before unregulated crossings of the road network is the time spent by each vehicle due to the passage of pedestrians crossing the roadway. Therefore, with a high intensity of pedestrian flows, vehicles need to spend more time to pass the crossing [2-4]. It is known that as the intensity of pedestrian flow increases, vehicle delays increase and the area of influence of unregulated pedestrian crossing on the traffic flow increases. However, the increase in the intensity of vehicles complicates the movement of pedestrians across the roadway, resulting in an increase in the likelihood of traffic jams [5]. Study object – processes of traffic and pedestrian flows in areas of unregulated pedestrian crossings. Scope ofresearch – dependencies that characterize the impact of unregulated pedestrian crossings on the capacity of streets and roads and vehicle delays. Goal of research: – develop a methodology for estimating vehicle delays on unregulated pedestrians; – to develop mathematical models and on their basis to perform calculations of vehicle delays at unregulated pedestrian crossings; – to carry out simulation modeling to determine vehicle delays before unregulated pedestrian crossings. During the video surveillance, the reasons for the formation of queues of vehicles in the area of pedestrian crossings were established. They are distributed as follows: in 41% of cases due to high traffic load (especially during rush hour); 25% - traffic light works; 19% - the proximity of intersections and 15% - the proximity of bus stops. The distribution of pedestrian crossings over the distance to the nearest intersection is as follows: in the area of the intersection are 45% of the total number of pedestrian crossings; at a distance of less than 200 m to the nearest intersection - 30% of pedestrian crossings; the other 25% of crossings are at a distance of more than 200 m to the intersection. Based on this, three options for the location of the overland pedestrian crossing relative to the intersection were identified: on the street (road); in the area of the intersection; in the area of influence of the intersection. During the study of vehicle delays in front of unregulated pedestrian crossings every 50 m, the intensity and speed of vehicles are recorded. According to the results of the research, the zone of influence of the formation of vehicle queues on the approach to the unregulated transition is determined, within which there is a decrease in the speed of cars with a further increase to the initial value. According to the results of the research, unregulated pedestrian crossings have an impact zone from 100 to 450 m. The speed on the street where the research was conducted varied between 39 and 24 km/h. The reduction of the average speed of traffic at the pedestrian crossing is on average up to 26 km/h, by an amount greater than at the crossings without it. The greatest transport delay is observed at the crossing in the intersection area and is 9.20 s. This is due to the fact that this value of delay is caused by the need to pass pedestrians and cars moving on the main road. The smallest transport delay is observed at the transition, which is located between intersections and is 5.9 s. In this case, the queue of vehicles formed on the approach to the crossing may depend only on the intensity of pedestrian flow, the impact of the intersection on the pedestrian crossing in this case is absent. It is established how the intensity of pedestrian traffic affects the amount of traffic delay in the area of unregulated pedestrian crossings. The presence of pedestrian impact reduces capacity by 10 - 20%. At low intensity of pedestrian traffic (up to 200 pedestrian/h) the values of transport delays are almost the same (up to 20 s). Intervals are formed between pedestrians, which allow vehicles to move almost without stopping. As the intensity of pedestrian traffic increases, the intervals become narrower, resulting in increased vehicle delays. Keywords: unregulated crossing, pedestrian flow, traffic flow, capacity, transport delays, queue length. References. 1. 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