Dynamic Network Pricing to Contain Urban Air Pollutionin Stochastic Environment


1 Institute for Transportation Studies and Research, Dept. of Civil Engineering, Sharif University of Technology (SUT), Azadi Ave., Tehran 14588, Iran

2 Sharif University of Technology

3 School of Civil Engineering, University of Tehran, Tehran, Iran


Network pricing is an effective transportation demand management scheme to reduce traffic and control air pollution, particularly in CBD’s. In this study, congested area cordon entry and Park-and-Ride (P/R) facility use are priced for automobiles. Increase in these prices may reduce private auto demand by impelling some of them into using public transport from the origin of their trips, or encouraging them to park their cars at the P/R facilities and use buses, or pay the entrance fee and drive inside the cordon. A Markov decision process has been devised to findan optimal policy for pricing the P/R facilities and cordon entry in a city within a variable demand context. This process is sensitive to weather condition (more favorable atmospheric condition allows lower prices). It leads to a balance between the costs of pollution hazards to the public at large on one side, and the cost imposed upon auto drivers to take the next best decisions and their travel times and costs on the other side: thus giving a resilient character to the city. The model has been applied to the network of a large urban area, and the results are analyzed. Suggestions for further research end the discussion.