Abstract
High Occupancy Toll (HOT) lanes have often not lived up to their forecastpotential for increased traffic volume or revenue generation. By automatically charging all vehicles that enter the HOT lane using video tolling, and requiring High Occupancy Vehicles (HOVs) to carry transponders to gain the HOV exemption, more usage, higher prices, less violation, and thus higher revenue will result. The paper analyzes the reasons that vehicle occupancy technologies have failed for HOT lane enforcement. The paper concludes that agencies should pursue the legal change needed to charge Single Occupant Vehicles (SOVs) without transponders in HOT lanes with video tolling.