The current urban transportation planning process is highly dependent on a complex set of travel demand models that operate at a relatively fine level of detail. These models ultimately produce travel assignments on alternative modes of travel. Unfortunately, these travel demand estimates are often insensitive to policy variables, and the process is often too cumbersome and time consuming to be used to test a wide range of transportation policy alternatives. This paper describes a complementary analytical method called the transit sketch planning process. It is purpose is not to supplant traditional, more detailed urban transportation planning but to extend the range of existing procedures. The transit sketch planning process uses a much more aggregated data base. A logit modal-choice model is adapted to operate at such a level of aggregation while producing transit-demand estimates that are consistent with detailed estimates. Policy alternatives can be evaluated with respect to their overall impact on central business district, city center, and suburban transit demand. With a complementary cost analysis, the degree of subsidy required for each policy alternative is estimated. Those policies that appear to be most promising can be further tested in the traditional urban transportation planning system to evaluate the detailed impacts at a zone-to-zone and facility level. The procedures do not attempt to advance the state of the art of transportation demand forecasting. Rather they attempt to use the best of existing procedures in a framework that can provide quick responses to transit policy questions that local planners must answer.

Media Info

  • Media Type: Print
  • Features: Figures; References; Tables;
  • Pagination: pp 1-11
  • Monograph Title: New approaches to travel forecasting
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00141288
  • Record Type: Publication
  • ISBN: 030902482X
  • Files: TRIS, TRB
  • Created Date: Oct 26 1981 12:00AM