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.

• 
• Corporate Authors:

  Institute of Transportation Engineers (ITE)

  Washington, DC  United States 
• Authors:
  • Basha, Paul E
• Conference:
  • ITE 2010 Annual Meeting and Exhibit
  • Location: Vancouver , Canada
  • Date: 2010-8-8 to 2010-8-11
• Publication Date: 2010

Language

• English

Media Info

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

Subject/Index Terms

• TRT Terms: Crashes; Exclusive permissive phasing; Frontal crashes; Left turn lanes; Left turn phase; Signalized intersections; Traffic safety; Two way left turn lanes
• Geographic Terms: Scottsdale (Arizona)
• Subject Areas: Highways; Operations and Traffic Management; I80: Accident Studies;

Filing Info

• Accession Number: 01321682
• Record Type: Publication
• Files: TRIS
• Created Date: Nov 30 2010 7:49AM