Abstract
The Path Flow Estimator (PFE) is a software tool for estimating flows and travel times in transportation networks. It has been developed to support both on-line urban traffic management and off-line transportation planning. Given data from vehicle detectors and other forms of sensor, path flows and path travel times are inferred on the basis of a logit path choice model. The delays incurred by congestion are taken into account. The most significant paths in the network are generated by the iterative use of a shortest path algorithm, using link costs reduced by shadow prices incurred by active constraints (like traffic counts). In order to better represent the transitory overloads which characterise congested conditions, a time-dependent PFE has been formulated. Various versions of the PFE have been specified and are being validated for a number of European test sites.
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