NIGHTTIME DIMMING OF TRAFFIC SIGNALS IN BALTIMORE, MD

Purpose of the project was to demonstrate an innovative type of traffic signal dimming device which required no external sensor or resettable time clock to determine when to reduce supply voltage. The theory of operation is discussed. A total of 100 dimmers were purchased. Once installation began, it was discovered that only certain locations could accept the dimmer without extensive wiring modifications. The dimmers operate on the ground side of the ac power supply, consequently, locations had to be chosen where the traffic signal ground was isolated from other equipment. Dimmers were installed over a period of four months. Previous shop testing indicated energy savings up to 25% over a period of day. This was based on a projected savings of 50% during the dimmed period which can last up to twelve hours. Results indicate that actual energy savings average 10%. The difference was due to the power consumption of the signal controller and detectors. (ERA citation 10:020924) consumption of the signal controller and detectors. (ERA citation 10:020924)

  • Supplemental Notes:
    • Paper copy only, copy does not permit microfiche production. production.
  • Corporate Authors:

    Baltimore City Department of Transit and Traffic

    Baltimore, MD  United States  821028
  • Authors:
    • Hannan, T J
  • Publication Date: 1982-10-28

Media Info

  • Pagination: 22 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00450271
  • Record Type: Publication
  • Report/Paper Numbers: DOE/R3/08070-T1
  • Files: TRIS
  • Created Date: Aug 27 2004 8:59PM