For the purpose of determining estimates of the amount of transportation-related tunneling activity likely to occur to 1990, a methodology was devised whereby the conditions necessary to justify the application of tunnel segments for mass transit facilities were identified and matched against the number of situations in which these conditions are likely to be fulfilled. A corollary outcome of the analysis is an appraisal of factors that affect the preference of one type of mass transit system over others and an understanding of the sensitivity of preferred system choice to these factors. A technical evaluation of supply and demand for alternative types of mass transit systems was conducted to determine the future viability of such systems for cities that do not have them. Results of city-by-city application of the methodology developed revealed that, with current construction costs and property values, three cities currently without mass transit systems--Detroit, Cincinnati, and Denver--would meet necessary conditions for tunneled systems by 1990. At the other extreme, tunnel distance was computed for conditions in which tunnel construction costs in real terms were postulated to fall to 40 percent of today's cost and right-of-way values to rise by 5 percent/year. Other sensitivity results for the preference of tunnels to new right-of-way and for the forecast of nationwide tunnel construction under other assumptions are also reported. /Author/

Media Info

  • Media Type: Print
  • Features: Figures; References; Tables;
  • Pagination: pp 1-8
  • Monograph Title: Tunneling and underground structures
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00196622
  • Record Type: Publication
  • ISBN: 0309028299
  • Files: TRIS, TRB
  • Created Date: Aug 28 1981 12:00AM