The relationship of design, economics, and energy conservation techniques for various interchange configurations (cloverleaf, diamond, half-cloverleaf and trumpet) is analyzed using four types of light sources (mercury vapor, metal halide, high-pressure sodium, and low-pressure sodium). The cost elements were grouped in three parts: maintenance, power, and capital costs. Amortizing the capital cost over 20 years at 8 per cent interest provides a comparison of the yearly costs and the light source efficiency for each design. Energy cost is analyzed to determine the effect on the total cost when there are variations in the power rate. The most economical source using the power rate applicable to New Brunswick does not remain the same when the power rate approaches 10 cents/kWh. The cost of high-mast lighting is compared with conventional lighting using high-pressure sodium as the light source. Although less expensive than mercury, it was found to be more costly than any of the three other sources. Full-partial lighting designs installed in the Province of New Brunswick are analyzed to determine power savings and their effect on highway safety. This method permits the majority of highway lighting to be turned off after a certain hour in the night, determined by highway accident and traffic flow rates. It was found that up to 36 per cent of power savings can be achieved. The full-partial lighting design for a new expressway will be described, which the authors feel can be easily applied to many existing lighting designs throughout the country. The possibility of using vehicle-activated illumination on future roadways is discussed. /LDA ABSTRACTS/

  • Corporate Authors:

    Illuminating Engineering Society

    120 Wall Street, 17th Floor
    New York, NY  United States  10005-4001
  • Authors:
    • Smith, R A
    • Goguen, G
  • Publication Date: 1975-6

Media Info

Subject/Index Terms

Filing Info

  • Accession Number: 00097618
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Jul 29 1975 12:00AM