Development of a Technique for Digital Computer Control of a Safety Warning System for Urban Freeways

Details

• Creators:
  Dudek, Conrad L.
• Corporate Creators:
  Texas Transportation Institute. Texas A&M University
• Corporate Contributors:
  Texas Highway Department ; United States. Department of Transportation. Federal Highway Administration
• Subject/TRT Terms:
  • Freeway operations
  • Traffic surveillance
  • Safety
  • Traveler information and communication systems
  • Traffic characteristics
  • Shock waves
  • Digital computers
• Publication/ Report Number:
  165-5
• Resource Type:
  Tech Report
• Geographical Coverage:
  Texas ; United States
• Corporate Publisher:
  Texas Transportation Institute. Texas A&M University
• Abstract:
  A control technique for digital computer control of a safety warning system for urban freeways was developed and evaluated. Traffic energy was used as the control variable. Computer logic was developed centered about critical energy as the control parameter. The ability of the critical energy parameter to detect stoppage waves was studied and evaluations were made of the performance, reliability, stability, and sensitivity of the control logic. Based on the results of this research, a revised control program was structured and later implemented to automatically control three prototype safety warning systems on the Gulf Freeway.
• Format:
  PDF
• Funding:
  2-8-72-165
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/85271/dot_85271_DS1.pdf
• File Type:
  [PDF - 2.40 MB]
• Collection(s):
  US Transportation Collection
• Main Document Checksum:
  urn:sha-512:ae5040a1662709e9ec14204fe75ceaedeca401c4be38848d31a87ee79e9ed392d1be179c4a1573853a70bd95cb221a6fab0b5f02e5f8bdd6e71681259ead5cf2