Transit assignment models are used to estimate the number of passengers that use transit segments and routes in a transit network as a function of transit level of service and fare. These models take as input an O-D matrix of passenger demand and a transit network, and produce transit segment, stop level, route level, and aggregate ridership statistics. Transit assignment procedures are used to predict travelers' choice of routes when faced with various alternatives for traveling to their destinations.
TransCAD Transportation Planning Software provides the widest array of traffic assignment procedures that can be used for modeling urban traffic. These procedures include numerous variants that can be used for modeling intercity passenger and freight traffic.