The road bridge across the Tay Estuary at Dundee, Scotland was opened on August 12, 1966. This bridge augments the existing rail bridge and replaced a ferry service. Detailed benefits and costs were calculated for the years 1966 to 1969 and for 1976, 1986 and 1996. Costs and benefits were discounted to a common base. The costs attributable to the bridge had two components; the initial capital cost of construction and the subsequent annual maintenance costs. The calculation of benefits required that a calculation of the total flows over the road system was made. For this, a modified gravity model was used to predict future flows of through traffic, while data from a land use/transportation study of the area were used to obtain local traffic flows. The cost savings were estimated as savings in; travel times; vehicle running costs; and the reduction in the number of accidents. Tables are given showing the costs/benefits for different types of vehicle and various years. The calculations show that the first year rate of return is between 25 and 30 per cent and the present value to cost ratio is of the order of 4.0. /TRRL/

  • Corporate Authors:

    University of British Columbia, Vancouver

    Faculty of Commerce
    Vancouver, British Columbia  Canada 
  • Authors:
    • Begg, H M
    • MILLS, G
  • Publication Date: 1974


  • English

Media Info

Subject/Index Terms

Filing Info

  • Accession Number: 00097967
  • Record Type: Publication
  • Source Agency: Transport and Road Research Laboratory (TRRL)
  • Files: ITRD, TRIS
  • Created Date: Oct 18 1975 12:00AM