METHODOLOGY FOR EVALUATING ATIS IMPACTS ON AIR-QUALITY

This paper presents an analytical method for evaluating the impact of rerouting traffic guided with Advanced Traveler Information Systems (A TIS) on air quality. The method is applied to a simple road network co mposed of two routes with one of the routes experiencing incident cong estion. The methodology can be extended to more complex networks. Tota l emissions of three air pollutants (GO, VOC, and NO,) on the two rout es are evaluated with and without ATIS. Emissions are evaluated for th ree time periods: 1993-98, 1998-2003, and the time period beyond year 2003. The findings indicate that a systemwide reduction of CO and VOC can be achieved through the implementation of ATIS. Further, more redu ction in emissions of CO and VOC can be achieved with higher ATIS mark et-penetration levels. However, except for small market-penetration le vels, ATIS may have a negative impact on NO, emissions. It is also fou nd that ATIS alone cannot compete with improved emission controls in r educing emissions. Emission controls and ATIS together can achieve gre ater reductions of emissions than can be achieved by emission controls alone, which is likely to eliminate the negative impact of ATIS on NO x emissions.