The Triborough Bridge and Tunnel Authority (TBTA) operates seven bridges and two tunnels in New York City, all of which charge tolls. The TBTA is contemplating increasing tolls in early 1993. This study had two purposes related to the potential increase. The first purpose was to determine the impact of the toll increase on traffic volumes and revenue. The second purpose of the study was to determine the impact on revenue of creating a new toll class. Currently the TBTA has nine classes of vehicles that pay differing tolls. Class 1, composed mostly of automobiles, is the largest class, accounting for over 90% of all vehicles. Class 1 also includes light trucks and commercial vans, vehicles of a different nature. The TBTA is considering creating a separate class €or these vehicles with a higher toll.