EVALUATION OF WARNING AND INFORMATION SYSTEMS. PART I. CHANGEABLE MESSAGE SIGNS

The report evaluates a changeable message sign system in Los Angeles providing warning and information to motorists. 35 bulb matrix signs were installed along 24 directional-miles of freeway. These signs were minicomputer activated via leased telephone lines and displayed operator selected messages. Electronic traffic surveillance provided incident detection, end-of-queue locations and the length of congestion. Field personnel and the Highway Patrol also detected and identified incidents. Areas included in this evaluation are public acceptance, vehicle speeds approaching a queue (closing speed), diversion, lane changes and accidents.

• Supplemental Notes:
  • Report on the Los Angeles Area Freeway Surveillance and Control Project (LAAFSCP).
• Corporate Authors:

  California Business and Transportation Agency

  P.O. Box 2304
  Los Angeles, CA  United States  90051

  California Highway Patrol

  777 W. Washington Boulevard
  Los Angeles, CA  United States  90015

  University of California, Los Angeles

  School of Architecture and Urban Planning
  Los Angeles, CA  United States  90024

  Federal Highway Administration

  1200 New Jersey Avenue, SE
  Washington, DC  United States  20590
• Authors:
  • Bogdanoff, M A
  • THOMPSON, R P
• Publication Date: 1976-7

Media Info

• Pagination: 226 p.

Subject/Index Terms

• TRT Terms: Acceptance; Computer programs; Computers; Cost estimating; Driver information systems; Estimates; Freeways; Highway traffic control; Information display systems; Information management; Information, data, and knowledge; Lane changing; Minicomputers; Motor vehicles; Motorist aid systems; Speed; Symbols; Traffic crashes; Traffic diversion; Traffic safety; Traffic speed; Traffic surveillance; Transmission lines; Warning systems
• Uncontrolled Terms: Motor vehicle accidents
• Geographic Terms: California
• Old TRIS Terms: Computer systems hardware; Computer systems programs; Displays
• Subject Areas: Data and Information Technology; Highways; Operations and Traffic Management;

Filing Info

• Accession Number: 00154856
• Record Type: Publication
• Source Agency: National Technical Information Service
• Report/Paper Numbers: FHWA/CA/RD-75/5 Final Rpt., CADOT-07-3130-1-75-5
• Files: NTIS, TRIS, USDOT
• Created Date: Jun 22 1977 12:00AM