An important aspect of the bus-tunnels proposed in this study is the practicality of converting the bus-tunnel to a subway system. The objectives of this study were 1) to determine if small diameter, unventilated, hence inexpensive tunnels could be used for bus links between the Central Business District (CBD) and outlying areas; 2 to estimate the cost of bus-tunnels; and 3) to indicate the basic features of an underground station and to make a rough cost estimate. The tunnels selected were 16 1/2 ft. inside diameter (same as a single-track tunnel conventionally used for recently constructed U.S. subway rail systems). Concentration levels of exhaust emissions were within acceptable limits to a capacity of 150 diesel buses per hour for a one route-mile bus-tunnel; for a two route-mile tunnel, 54 buses per hour were acceptable. The costs of such an underground guideway are moderate ($16M per route-mile with simultaneous operations in both directions). The incorporation of an underground station at the CBD end of the bus-tunnel, and the ventilation requirements for a typical station are also examined. The cost estimate for the station is in the range of $26-39M. Based upon service, operations, and costs, this report states that use of small diameter, unventilated tunnels for bringing diesel buses into the CBD appears attractive and should be considered. (UMTA)

  • Availability:
  • Supplemental Notes:
    • Related report is the Effects of Tunnel and Station Size on the Costs and Service of Subway Transit Systems (UMTA-CA-06-0116-79-2).
  • Corporate Authors:

    Jet Propulsion Laboratory

    California Institute of Technology, 4800 Oak Grove Drive
    Pasadena, CA  United States  91103

    Urban Mass Transportation Administration

    400 7th Street, SW
    Washington, DC  United States  20590
  • Authors:
    • Dayman Jr, B
  • Publication Date: 1979-3

Media Info

  • Pagination: 61 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00322275
  • Record Type: Publication
  • ISBN: CA-06-0116
  • Report/Paper Numbers: UMTA-CA-06-0116-79-1Final Rpt.
  • Contract Numbers: DOT-AS-60019
  • Files: TRIS, USDOT
  • Created Date: Feb 6 1981 12:00AM