DEMAND FOR URBAN GOODS VEHICLE TRIPS

This paper describes the results of the first of several investigations that have explored the relationship between the generation and distribution of intraurban goods vehicle trips and the spatial structure of the Boston metropolitan region. An aggregate trip-end generation model is presented that illustrates that zonal trip-end generation rates vary systematically with the density and mix of socioeconomic activities, the usage of vehicles of different sizes, and the location from the center of the region. An industry-specific direct demand model is employed to analyze the generation and distribution of trips in delivery routes as a function of the supply of transportation and activity systems variables. The linked nature of goods vehicle trips is found to require modifications in the formulation of planning models and to give rise to the differential contribution of goods-producing and goods- consuming activities to levels of goods vehicle traffic. /Author/