Validating Travel Time Delay Quantification and Measurement Methods for Vermont Work Zones

Details

• Creators:
  Sullivan, Jim ; Sentoff, Karen
• Corporate Creators:
  VHB/Vanasse Hangen Brustlin, Inc. ; RSG - Resource Systems Group ; UVM Consulting Group, LLC
• Corporate Contributors:
  Vermont Agency of Transportation ; United States. Department of Transportation. Federal Highway Administration
• Subject/TRT Terms:
  Data Collection Measuring Methods Performance Measurement Quantitative Analysis Reliability Specifications Traffic Delays Travel Time Delay Travel Time Reliability Work Zone Capacity Work Zone Delay Work Zone Safety

  More +
• Publication/ Report Number:
  2025-04
• Resource Type:
  Tech Report
• Geographical Coverage:
  United States ; Vermont
• Edition:
  Final Report: 2023-2025
• Corporate Publisher:
  Vermont Agency of Transportation
• Abstract:
  Although the Vermont Standard Specifications for Construction identify an acceptable delay in work zones of less than 10 minutes per operation and less than 15 minutes cumulatively for a project maintaining one-way traffic, it is recognized that these thresholds have been set without consideration for context, procedures for measuring delay, or methods for mitigating delay. The objectives of this project were to validate the efficacy of various types of travel-time delay measurement methods and quantify the delays incurred across a variety of work zones in Vermont. In terms of mobility performance measures, travel time reliability metrics proved most effective at quantifying work zone mobility across test sites, delivering metrics that were both quantitative and easy to understand. Outcomes from the travel time reliability assessment were used to inform a framework for measuring travel time mobility metrics, setting work zone specific acceptable thresholds of travel time, and assessing work zone performance. Recommended methods for measuring work zone travel time performance and buffer indices to set acceptable travel time thresholds were based on project specific significance levels and traffic volumes. A travel time reliability approach to mobility performance measurement for work zones builds on an expanding body of research and is enabled by technological advances in data collection to support such measures.
• Format:
  PDF
• Funding:
  VTRC023-604
• Collection(s):
  US Transportation Collection
• Main Document Checksum:
  urn:sha-512:1e02bcf020aba1b26c3513e075547a9d0f7adf89d2bd4d90a33c25e2a4eb36f1c38e1d7afe61ad729fc4c033ca6301035b59737c99cd9dca30bdacb1aca53d2b
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/88824/dot_88824_DS1.pdf
• File Type:
  [PDF - 2.48 MB ]