Assessing segment- and corridor-based travel-time reliability on urban freeways : final report.

Details

• Creators:
  Dong, Jing ; Lu, Chaoru ; Liu, Chenhui ; Hawkins, Neal R.
• Corporate Creators:
  Iowa State University. Center for Transportation Research and Education ; Iowa State University. Institute for Transportation
• Corporate Contributors:
  United States. Department of Transportation. Office of the Assistant Secretary for Research and Technology ; Midwest Transportation Center
• Subject/TRT Terms:
  Estimating Forecasting Freeways Highway Corridors Performance Measures Probe Vehicles Reliability Simulation Travel-time Distribution Travel-time Reliability Travel Time Urban Highways Vissim Simulation Weather Conditions Freeway Operations

  More +
• Resource Type:
  Tech Report
• Geographical Coverage:
  United States;Iowa
• Edition:
  Final report
• Corporate Publisher:
  Iowa State University. Institute for Transportation ; Iowa State University. Center for Transportation Research and Education
• Abstract:
  Travel time and its reliability are intuitive performance measures for freeway traffic operations. The objective of this project was to quantify segment-based and corridor-based travel time reliability measures on urban freeways. To achieve this objective, a travel-time estimation model and a travel-time reliability prediction framework were developed. The proposed travel-time estimation model considers spatially correlated traffic conditions. Segment-level and corridor-level travel-time distributions were estimated using travel time estimates and compared with estimates based on probe vehicle data. Corridor-level travel-time reliability measures were extracted from travel-time distributions. The proposed travel-time estimation model can well capture the temporal pattern of travel time and its distribution. For the corridor-level travel-time reliability prediction framework, travel time observations are classified based on weather conditions, segment travel-time distributions are estimated, and segment travel-time distributions are synthesized to corridor travel-time distributions. The segment travel-time distribution estimation model was found to capture the pattern of actual travel-time distributions and could adequately represent the short-term corridor-level travel-time distributions. The proposed travel-time reliability prediction framework provides a systematic way to estimate real-time and near-future corridor travel-time reliability by considering weather impact. A Vissim simulation calibrated to Iowa compared travel-time distribution based on simulated data to that based on probe vehicle data. The simulated travel-time distribution is similar to the travel-time distribution based on probe data.
• Format:
  PDF
• Funding:
  Part of DTRT13-G-UTC37
• Collection(s):
  US Transportation Collection
• Main Document Checksum:
  urn:sha-512:20021b444c3ce40e4ac6958badd505e8e703b746372632dc4834a413133bc8b3f4f0b38da1c3ca7a72a7a4a6b3e023c3ab542704cf9e03d5b6f517dea2558687
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/31352/dot_31352_DS1.pdf
• File Type:
  [PDF - 2.78 MB ]