Define traffic assignment in transportation system and discuss the major aims of traffic assignment?

It is the method of assigning a set of trip interchange data to a specified transportation system. The vehicular movements that may be observed when demands in the trip matrices are satisfied are reproduced here.

 The main aims of traffic assignment are to: • estimate the volume of traffic on a network.  • estimate the turning movements at intersections.

 • estimate cost between the origin and destination of a trip.

 • obtain average network measures, such as total distance covered, total time take, and so on

 • estimate travel cost and time for a zone-to-zone trip.

 • obtain link flows and identify the congested links.

 • estimate routes to be used between each origin-destination (O-D) pair

 • analyse each O-D pair that uses a particular path or link.