The report describes a computer-based traffic assignment and queueing model for use in the design of urban traffic management schemes. The model is called CONTRAM - continuous traffic assignment model. CONTRAM requires data on time-varying flow demands (for example as occur in a 'peak period'), and predicts the flows, delays and queues throughout a network of roads and junctions. The movement of traffic is modelled by grouping vehicles together to form 'packets'. Each packet is assigned to its minimum journey time route through the network, taking into account delays and queues at junctions. The report is divided into three parts. The first part outlines the assumptions and structure of the model. The development of the model, sensitivity tests and validation work are described in the second part and examples to illustrate applications of the model are described in the third part. (Author/publisher)
Samenvatting