Impacts Assessment of Dynamic Speed Harmonization with Queue Warning

This report assesses the impacts of a prototype of Dynamic Speed Harmonization (SPD-HARM) with Queue Warning (Q-WARN), which are two component applications of the Intelligent Network Flow Optimization (INFLO) bundle. The assessment is based on an extensive analysis of the Prototype using a Vissim simulation model for the US 101 freeway corridor in San Mateo, CA as well as an evaluation of a small-scale demonstration that was conducted in Seattle, WA. Results from the simulation analysis found that the Prototype significantly reduces the magnitudes of the speed drops (shock waves) between vehicles, even at the 10-percent market penetration level. This is considered to benefit safety by reducing the probability of collisions where free-flowing traffic meets the back of a queue. The trade-off for the improved safety is that the Prototype increases the geographic impact of existing bottlenecks on freeway speeds by expanding the upstream distance that is affected by congestion.

• Record URL:
  https://rosap.ntl.bts.gov/view/dot/3554
• Record URL:
  https://rosap.ntl.bts.gov/view/dot/32571
• Corporate Authors:

  Kittelson and Associates, Incorporated

  300 M Street, SE, Suite 810
  Washington, DC  United States  20001

  Federal Highway Administration

  1200 New Jersey Avenue, SE
  Washington, DC  United States  20590

  Department of Transportation

  Intelligent Transportation Systems Joint Program Office
  1200 New Jersey Avenue, SE
  Washington, DC  United States  20590
• Authors:
  • Dowling, R
  • Skabardonis, A
  • Barrios, J
  • Jia, A
  • Nevers, B
• Publication Date: 2015-6

Language

• English

Media Info

• Media Type: Digital/other
• Features: Appendices; Figures; Maps; Tables;
• Pagination: 140p

Subject/Index Terms

• TRT Terms: Prototypes; Traffic queuing; Traffic simulation; Warning systems
• Identifier Terms: Intelligent Network Flow Optimization (INFLO); VISSIM (Computer model)
• Uncontrolled Terms: Speed harmonization
• Geographic Terms: San Mateo (California); Seattle (Washington)
• Subject Areas: Highways; Operations and Traffic Management; I73: Traffic Control;

Filing Info

• Accession Number: 01575242
• Record Type: Publication
• Report/Paper Numbers: FHWA-JPO-15-222
• Contract Numbers: DTFH61-12-D000044-T-13001
• Files: NTL, TRIS, ATRI, USDOT
• Created Date: Aug 31 2015 5:23PM