I-25 South Gap Queue Warning System Evaluation

Details

• Alternative Title:
  I-25 Gap Queue Warning System Evaluation
• Creators:
  Waldman, Ben ; Freitas, Jason ; Stamp, Alvin ; Karimi, Negar
• Corporate Creators:
  Apex Design, PC
• Corporate Contributors:
  Colorado. Department of Transportation. Applied Research & Innovations Branch ; United States. Department of Transportation. Federal Highway Administration
• Subject/TRT Terms:
  Construction Evaluation Lessons Learned Mobility Warning Systems Work Zone Safety
• Publication/ Report Number:
  CDOT-2020-17
• Resource Type:
  Tech Report
• Geographical Coverage:
  United States ; Colorado
• Edition:
  Final Report: (Aug 2019 – May 2020)
• Corporate Publisher:
  Colorado. Dept. of Transportation. Applied Research and Innovation Branch
• Abstract:
  During a construction project, traffic traveling through the construction zone experiences frequent instances where construction vehicles, incidents, and recurring congestion interrupt traffic flow that result in long queues and delays as well as increased crash rates. In an effort to help mitigate these instances, CDOT has deployed numerous smart work zone systems throughout the I-25 Gap construction zone including Queue Warning Systems (QWS)This report discusses the deployment of a QWS in the I-25 Gap work zone. Lessons learned regarding the QWS set up are discussed and field speed data has been analyzed to verify the system was operating as intended and to quantify the effectiveness of it. The results are intended to give CDOT confidence QWS are effective in mitigating sudden stops due to unanticipated queueing. Two measures of effectiveness (MOEs) were observed and evaluated for a one month period with I-25 Gap QWS activated (December 2019) and a one month period with the system deactivated (September 2019). The two MOEs include: 1. The average speed of vehicles during queue warning activation consisting of spot measurements of average speeds at each sensor location during QWS activation time periods. 2. The comparison of abrupt speed drop frequencies within 1 minute periods during QWS activation periods. Taken together, the results of the Average Speed and Abrupt Speed Reduction measures of effectiveness demonstrate the positive impacts of the QWS on traffic flow.
• Format:
  PDF
• Funding:
  320.05
• Collection(s):
  US Transportation Collection
• Main Document Checksum:
  urn:sha-512:c17e64ba39ebce1063131b397fa6d987830910a2059d9213494e187e9512e2f4f92a700e8dee4356b3d469f5a4e6bc3541a38eaf54dfc990b20cd3df258a9553
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/88621/dot_88621_DS1.pdf
• File Type:
  [PDF - 3.87 MB ]