THE TRI-MET QUIET TRANSIT BUS PROJECT: A CASE STUDY

This report details the cooperative activities of a number of agencies at the Federal, State and local levels both to improve downtown transit-bus service and to reduce the noise associated with that service. Starting from a baseline of 80 dBA a reduction of about 4 dBA has been achieved, and the reduction involved only the use of "operationally acceptable" noise treatments. Additional quieting seems attainable with application of advanced technology concepts. "Operationally acceptable" in the context of this study means noise treatments that the management of Tri-Met accepted as not having a detrimental effect on maintenance. For those Portland buses that had 80 dBA noise levels initially, the operationally acceptable noise treatment will give a reduced noise level of 76 dBA.

• Corporate Authors:

  ORI, Incorporated

  1400 Spring Street
  Silver Spring, MD  United States  20910

  Environmental Protection Agency

  Office of Noise Abatement and Control, 1921 Jeff Davis Hwy
  Arlington, VA  United States  20460
• Authors:
  • Greenstone, R
  • Benson, W
• Publication Date: 1980-12

Media Info

• Pagination: 122 p.

Subject/Index Terms

• TRT Terms: Buses; Case studies; City planning; Feasibility analysis; Federal assistance programs; Noise; Noise control; Reduction (Chemistry); Sound level; Technological innovations; Transportation; Urban development; Urban transportation
• Uncontrolled Terms: Economic assistance; Noise reduction; Transportation noise
• Old TRIS Terms: Modification kits; Reduction
• Subject Areas: Planning and Forecasting; Transportation (General); Vehicles and Equipment; I72: Traffic and Transport Planning;

Filing Info

• Accession Number: 00338199
• Record Type: Publication
• Source Agency: National Technical Information Service
• Report/Paper Numbers: ORI/TR-1849 Tech Rpt.
• Contract Numbers: EPA-68-91-5040
• Files: TRIS
• Created Date: Sep 16 1982 12:00AM