Median U-Turn Design As An Alternative Treatment For Left Turns At Signalized Intersections

Details

• Creators:
  Bared, Joe G. ; Kaisar, Evangelos I.
• Corporate Creators:
  United States. Federal Highway Administration
• Corporate Contributors:
  Turner-Fairbank Highway Research Center
• Subject/TRT Terms:
  • Left turns
  • Median openings
  • Signalized intersections
• Resource Type:
  Tech Report
• Geographical Coverage:
  United States
• Corporate Publisher:
  United States. Federal Highway Administration
• Abstract:
  Many signalized intersections experience recurring congestion and safety problems. For certain flow patterns and high traffic volumes, innovative or non-conventional designs are possible cost effective solutions. A median u-turn treatment at a signalized intersection is evaluated for a four-lane highway intersecting another four-lane road. The u-turn design is compared to a conventional geometry with direct left turning flows. TRANSIT-7F is used to optimize the signal timing and CORSIM to estimate traffic flow performance without validation or recalibration of the default parameters. A significant reduction in travel time is noted for the design with median u-turn at high volumes and high left-turning proportion. A reduction in stop time ranges from 10 to 40 seconds per vehicle.
• Format:
  PDF
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/41860/dot_41860_DS1.pdf
• File Type:
  [PDF - 347.76 KB]
• Collection(s):
  Federal Highway Administration
• Main Document Checksum:
  urn:sha-512:9ee7135c28c4ebc37afe4436ac8f3704e565b1c59e5026a0f5bb1e9907763006df96d7602944a5b8a99c224126eb539b7cf2f77113c6bd35834d1bd4f87752b7