Title: Urban Velocity Fields
Article in: Environment and Planning; Vol. 2, No. 2
Authors: Shlomo Angel, Geoffrey M Hyman
First published: 15 January, 1970
Pages: 211-224
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.
