The division of trips between different modes of travel (private transport, public transport).

An indication of the proximity of a person, site or zone to a particular activity or group of activities. It is also defined as the ease or difficulty of making trips to or from each zone.

Data that relates to a mass of group of people, vehicles or area. The collective properties of the variable are of interest.

A traffic assignment technique that takes into account the build up of congestion with increased traffic volumes. It adjusts the link travel times according to the prevailing flows.

Imaginary links that represent the street network within a zone. They ‘connect’ trips from a zone to the modelled network.

The point or area of termination of a trip.

Data at the level of individual persons, households, etc.

The number of employees, or jobs, in relation to the zone of work. This may be stratified by employment type e.g. retail, manufacturing, etc.

A trip that has either an origin or destination, but not both, in the study area.

An assignment process by which all used routes between zone pairs have equal and minimum costs, while all unused routes have greater or equal costs.