Editing Route assignment (section)

{{Short description|Transportation networks}}
{{about|transport modelling|computer networking|routing}}
'''Route assignment''', '''route choice''', or '''traffic assignment''' concerns the selection of routes (alternatively called paths) between origins and destinations in [[transport network|transportation network]]s.  It is the fourth step in the conventional [[transportation forecasting]] model, following [[trip generation]], [[trip distribution]], and [[mode choice]]. The zonal interchange analysis of trip distribution provides origin-destination trip tables.  Mode choice analysis tells which travelers will use which [[transport mode|mode]].  To determine facility needs and costs and benefits, we need to know the number of travelers on each route and link of the network (a route is simply a chain of links between an origin and destination). We need to undertake traffic (or trip) assignment.  Suppose there is a network of [[highway]]s and [[Public transport|transit]] systems and a proposed addition.  We first want to know the present pattern of [[traffic]] delay and then what would happen if the addition were made.

{{wikibooks|Operations Research|Transportation and Assignment Problem}}