Trip generation: Introduction to the special section

This paper introduces a set of articles about how transportation planners need better tools for estimating trip generation, and to develop better tools we need more data collection, especially methods that capture passenger trips by personal vehicles, transit, walking, and bicycling, as well as freight trips. With such data in hand, researchers would be able to develop models that both produce more accurate estimates of vehicle trips and generate trip estimates for other passenger modes and for freight. Such estimates would help to ensure adequate provision for these modes and not just for cars.