Beta 1

Title Indførelse af kaoskryds i signalregulerede kryds
Author Larsen, Jesper
Supervisor Hels, Tove (Traffic Safety, Department of Transport, Technical University of Denmark, DTU, DK-2800 Kgs. Lyngby, Denmark)
Institution Technical University of Denmark, DTU, DK-2800 Kgs. Lyngby, Denmark
Thesis level Master's thesis
Year 2008
Abstract Abstract This project-”implementation of pedestrian scrambles in signalized intersections” is structured upon two main purposes: To give a technical analysis of pedestrian scrambles, and to evaluate the potential for implementing scramble-phasing in intersections in Copenhagen, including an assessment of their impacts on some traffic types, mainly the cars. The technical analysis consists of a general technical description of pedestrian scrambles as an infrastructure element, which changes the city quality, including theoretical derivations of the impacts on traffic related issues. Finally this is compared to a compilation of perceptions from existing scrambles, based on a literature study. Through this it is found that pedestrian scrambles are unambiguously 􀂃 Providing reduced number of car/pedestrian-accidents. 􀂃 Providing reduced travel time for pedestrian wanting to cross the intersection diagonally. 􀂃 Providing more efficient flow for right- turning traffic. 􀂃 Providing a safer perception of the intersection for pedestrians 􀂃 Providing a more pedestrian-friendly area around the intersection, perceived by pedestrians. 􀂃 Causing more disobedience towards the signals due to longer waiting times for the pedestrians, causing worse conduction of traffic on the most traffic directions due to increased waiting time. 􀂃 Causing slightly increased delay for pedestrian wanting to cross the intersection straight- over. The potential for implementing pedestrian scrambles in Copenhagen is first analyzed by observations in several intersections and addressed the effects previously found. The observations result in a selection of the most suitable intersections to become pedestrian scrambles in Copenhagen, namely the intersections - Kongens Nytorv/Lille Kongensgade, Kongens Nytorv/Gothersgade and Bremerholm/Lille Kongensgade. Next, the impacts on the chosen locations are assessed, primarily by micro simulation with VISSIM, which is utilized to optimize the signal design according to the car-traffic. Thus the impacts on the car traffic are simulated and compared to the situation before implementing pedestrian scrambles. Through the simulations it is evident that not all car traffic is negatively affected by pedestrian scrambles, since green time can be both increased and decreased in a pedestrian scramble. This is possible now that the intersection area only has to be cleared once for pedestrians, providing more efficient green time, despite an increased pedestrian clearance time. Where having increased green time, the traffic flow in the straight- out directions where all improved but in the right turns, however, there is no general conclusion on the performance or the increased efficiency of the flow due to the many bicyclists in Copenhagen. Where having decreased green time, the traffic flow was always negatively affected. Theoretically the pedestrians should experience general improvements with a pedestrian scramble, but in the Kongens Nytorv/Gothersgade -intersection the average time consumption for a pedestrian is calculated to be increased. Thus, this intersection should not be considered as a potential scramble, in contradiction to the two other intersections, which overall have positive impacts. The question wether a pedestrian scramble is the right solution for transforming a signalized intersection, depends on the preferences among the pedestrians using the intersection. And so, despite the fact that a pedestrian scamble immediately seems to help out some problems for pedestrians, it will also provoke other negative reactions, which is mainly perceived through the analysis in the changed conditions in the Kongens Nytorv/Gothersgade –intersection. The potential for scrambles in Copenhagen is exclusively regarded to be in the intersections Kongens Nytorv/Lille Kongensgade and Bremerholm/Lille Kongensgade
Original PDF JesperLarsen022058.pdf (2.67 MB)
Admin Creation date: 2009-01-12    Update date: 2009-01-12    Source: dtu    ID: 233714    Original MXD