Travel Time Reliability Based Traffic Assignment Model for an Urban Road Network in New Delhi

摘要

Driver’s behaviour in traffic congestion is different from that in uncongested traffic condition. When traffic is uncongested motorists choose the path on basis of travel time. But in traffic congestion, motorists might choose the path based on travel time reliability due to uncertain from the system. The objective of the study is to introduce travel time reliability based traffic assignment techniques for road transport network. For this, Method of Successive Average (MSA) solution algorithm is considered for solving user equilibrium assignment and reliability based user equilibrium technique. The developed Reliability User Equilibrium (RUE) model is applied to a small urban road network connecting origin (CRRI) destination (Ashram Chowk) on NH2 and an alternative path connecting the same origin and destination. Speed and travel time data is collected using Probe vehicle technique and Traffic volume data has been considered from the previous surveys. Preliminary data analysis has been done to find travel time, average speed, running speed and delay. These data were used to model the conventional travel time assignment model using MSA algorithm for traffic assignment. Link/ path travel time reliability modeled by considering Weibull probability distribution function. Results observed from this study emphasises that RUE based assignment based model are efficient than the UE based model in route choice assignment under uncertain conditions. Further study is required to implement on medium size road network.