The results of a research project to synthesize existing information on continuous two-way left-turn median lanes and to conduct before-and-after studies to evaluate the effectiveness of such lanes as an access control measure are presented. Recommendations were prepared for the traffic engineer concerned with the evaluation of a situation in which a two-way left-turn median lane is a potential solution to existing capacity and safety problems. The research approach included studies in three distinct areas: a nationwide expert opinion survey, a literature review, and before-and-after field studies. Both the literature review and the survey indicated that two-way left-turn median lanes work well in spite of a wide variety of methods of signing and marking. There is uniform agreement that these lanes have excellent safety records; specifically, head-on collisions in the lanes are extremely rare. The before-and-after studies demonstrated that the effectiveness of the lanes and public reaction depend on proper engineering. A step-by-step decision-making strategy has been developed for the implementation of two-way left-turn median lanes. /Author/

Media Info

  • Media Type: Print
  • Features: References; Tables;
  • Pagination: pp 62-69
  • Monograph Title: Traffic control devices, visibility and geometrics
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00196641
  • Record Type: Publication
  • ISBN: 0309028264
  • Files: TRIS, TRB
  • Created Date: Sep 15 1979 12:00AM