Impacts of Vehicle Emission on Network Assignment

Vehicle emission have negative effects on human health. City residents will consider the risks which traffic pollution posts to the personal health when making travel choices. The survey in this paper demonstrates that non-motorists may take actions to reduce their exposure to transportation-related emission. To evaluate this effect, the disutility of vehicle emission based on the cost function of discrete choice model is introduced, and a new definition of the extra time that cyclists would spend in changing traffic modes or routes to reduce their exposure to emission is proposed. A network assignment model with regards of the disutility of vehicle emission and a solution procedure are established. Finally, a numerical example is provided to compare the difference between the bicycle network assignment with the consideration of the disutility of vehicle emission or without this consideration.