Collision Experience at Dual-left-turn Lane versus Single-left-turn Lane Permissive and Exclusive Operation

This investigation compares collisions at intersections with permissive-and-exclusive left-turn arrow operation. Three (3) intersections included dual-left-turn lanes in only one direction and three (3) intersections included single-left-turn lanes in both directions. Seventeen years of data were analyzed. The analyses of the collision experience in the City of Scottsdale, Arizona, USA reveals that there is a statistical significant difference in the percentage of collisions involving left-turning vehicles and the left-turn collision rates between permissive-and-exclusive left-turn arrows with dual-left-turn lanes in only one direction, and permissive-and-exclusive left-turn arrows with single-left-turn lanes in both directions. For both collision measures, the intersections with permissive-and-exclusive left-turn arrows with dual-left-turn lanes in only one direction experienced more collisions than the intersections with permissive-and-exclusive left-turn arrows with single-left-turn lanes in both directions. Of greatest importance are left-turn-head-on collisions - the most critical types of left-turn collisions. The mean left-turn-head-on collision rate at intersections with permissive-and-exclusive left-turn arrows with dual left-turn lanes in only one direction was discovered to be approximately three times the mean collision rate at intersections with permissive-and-exclusive left-turn arrows with single left-turn lanes in both directions.

Language

  • English

Media Info

  • Media Type: Web
  • Features: Figures; References; Tables;
  • Pagination: 19p
  • Monograph Title: ITE 2010 Annual Meeting and Exhibit

Subject/Index Terms

Filing Info

  • Accession Number: 01321682
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Nov 23 2010 1:59PM