Toll plaza operation is a critical component of roadway operations throughout the United States, as tolls provide both a means of revenue for expansion and opportunity for demand management. Efforts to maximize vehicle throughput and reduce delay has led to the emergence of electronic toll collection (ETC), a paramount solution to congestion reduction at these major highway bottlenecks. While new payment collection strategies have arisen, traditional cash payments are generally still accepted. In turn, ETC has introduced a new form of driver decision making at toll plazas due to payment choices.