Operational Effects of Right Turns Followed by U-Turns at Signalized Intersections as Alternatives to Direct Left-Turns from Driveways

A widely used access management treatment's operational effects were analyzed by the authors: using, as a direct left-turn alternative, downstream signalized intersection U-turns. Data from more than 300 traffic hours at eight selected Tampa Bay, Florida, area roadway segments was collected. Based on the field data collected, regression models were developed for U-turn and left-turn operational impact quantitative evaluation. It would be particularly helpful, for identification of circumstances in which vehicles making direct left-turns (DLT) will have more travel time and delay than those making right turns followed by U-turns (RTUT), to use delay models, which provide a tool to quantitatively evaluate U-turns' operational impacts. Also, a ratio method for estimating how many drivers, under specific roadway geometric conditions and specific traffic volume levels, would like to make an RTUT instead of DLT, was developed. Study findings help provide six to eight lane suburban or urban arterial median treatment design and selection recommendations to state and local transportation agencies.


  • English

Media Info

Subject/Index Terms

Filing Info

  • Accession Number: 01051984
  • Record Type: Publication
  • Files: TRIS, ATRI
  • Created Date: Jun 25 2007 9:31AM