Title: Urban Travel Time
Article in: Papers and Proceedings of the Regional Science Association; Vol.27
Authors: Shlomo Angel, Geoffrey M Hyman
First published: January 1971
Overview: The city is not an undifferentiated terrain and travel does not occur along straight-line paths at constant velocities. Variations in travel velocities at different locations bend the minimum time paths away from regions of high congestion. This paper discusses a transformation of the urban plane into a time surface on which distance corresponds to travel time, and describes the construction of minimum paths and isochrones for various velocity fields.