PROBABILISTIC MODELS FOR PEDESTRIAN CAPACITY AND DELAY AT ROUNDABOUTS

摘要: The increase of the popularity modern roundabouts in urban settings creates need to assess their impact on pedestrian delays and capacities. This paper presents an analytical approach for calculation crossing capacity delay at roundabouts. Comparisons between signalized intersections are also provided. is conceptualized with help maximum rate (MPCR). MPCR based a probabilistic gap acceptance model. model made possible following practical assumptions: (a) priority cannot be given crosswalk (b) arrival approaching vehicles follows distribution. calculated existing "Highway Capacity Manual" considering signal phases timing. As MPCRs both intersection alternatives proposed, resulting can compared. Queuing theory principles under M/M/1 (random arrivals/random departures/one server) service order (first first out, FIFO) conditions employed this purpose. compared set experimental conditions. results indicate that provide more than traffic up 1000 veh/h/direction. comparison confirms intuitive concept lower light vehicle traffic. In paper, has been suggested from application presented discussed. These models, concepts, themselves may useful evaluate performance respect pedestrians. Employment alternative distributions expected enhance applicability, accuracy, diversity recommended future studies.