Now using the Dijkstra’s Method (Appendix- J) the shortest distance in terms of GTC from one
node to the other node for different modes (Appendix- K) is calculated. Here all-or-nothing
assignment for calculating the traffic flow for different modes from one node to other node is
considered. In highly congested areas, particularly in large urban areas, the finite amount of
physical highway capacity results in the spreading of the peak periods. While it is not possible for
a roadway to carry an hourly volume of traffic that is greater than its theoretical maximum
capacity, the highway assignment algorithms commonly used can produce traffic volumes on
roadways that exceed the capacity. In these cases, the volume of traffic assigned during the peak
periods must be constrained and change as the capacity of the highway system is reached