Examine Trade-Offs Between Center Separation and Shoulder Width Allotment for a Given Roadway Width [Project Summary]

Details

• Creators:
  Geedipally, Srinivas R. ; Brewer, Marcus A. ; Wunderlich, Robert ; Pratt, Michael ; Wu, Lingtao ; Das, Subasish ; Florence, David
• Corporate Creators:
  Texas A&M University. Texas Transportation Institute
• Corporate Contributors:
  Texas Department of Transportation. Research and Technology Implementation Office ; United States. Department of Transportation. Federal Highway Administration
• Subject/TRT Terms:
  • Alternatives analysis
  • Crash risk forecasting
  • Highway design
  • Medians
  • Road shoulders
  • Rural highways
  • Two way left turn lanes
  • Crashes
  • Geometric curves
  • Guidelines
  More +
• Publication/ Report Number:
  0-7035
• Resource Type:
  Brief
• Geographical Coverage:
  United States ; Texas
• Edition:
  Project Summary
• Corporate Publisher:
  Texas Transportation Institute. Texas A&M University
• Abstract:
  In this research project, researchers evaluated the safety and operational benefits of converting a four-lane undivided highway into other cross-section alternatives without changing the total roadway width. First, researchers selected a sample of rural highway segments with various cross sections, including four-lane undivided, four-lane with a 4-ft median buffer, four-lane with a TWLTL, Super 2, and Super 2 with a TWLTL cross sections. Researchers analyzed five years of crash data to determine the relationship between crash frequency, exposure, access point density, horizontal curvature, cross-sectional widths, and operating speed variables. Researchers conducted the analysis for several collision types to develop guidelines for selecting one cross section over the other. The guidelines account for traffic exposure, cross-sectional width, and access point density, which are the three key variables for selecting a cross-section type.
• Format:
  PDF
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/91835/dot_91835_DS1.pdf
• File Type:
  [PDF - 195.72 KB]
• Collection(s):
  US Transportation Collection
• Main Document Checksum:
  urn:sha-512:a07fec3d2d907c6641fc175d1c3779763fd3b5e9c0ae7d46261f43d19bf56ae9c5b65ac2a897553697a58cf5cfc434e2315bf5bf261eed21b1ef117b62c920fa