A COMBINED PARKING AND TRAFFIC ASSIGNMENT MODEL

Parking problems seriously affect vehicle and pedestrian movements in the central business districts of large and heavily populated sites. This paper considers the interaction between parking supply, by type and location, and the vehicular traffic assigned to the urban street network. The network is defined in terms of nodes and links in the study. A two-way street for example is described as two links, one for each direction. The model is structured to include a generalised cost function, route choice and traffic assignment. The components of the program are described and a simplified flow-chart is included. An example is given of the application to a hypothetical network. The results indicate that the minimum route changes according to the parking management scheme applied to each zone. Significant changes in the assigned link volume are observed for the two cases examined. One case represents the current parking conditions where illegal parking is present. The other case illustrates a parking condition controlled by the elimination of all on-street parking in one zone and an increase of on-street metered parking and off street parking in the other two zones. (TRRL)