GUIDELINES FOR THE USE OF NO U-TURN AND NO-LEFT TURN SIGNS. FINAL REPORT

The objective of this study was to establish a set of written guidelines identifying traffic and road conditions where No U-Turn and No Left Turn signs should be installed. The effect of thses signs on traffic safety was also investigated. A questionnaire was sent to all Virginia Department of Transportation District Traffic Engineers, selected city and county traffic engineers in Virginia, and selected state, city and county traffic engineers outside of Virginia, asking about their current procedures for installing No U-Turn and No Left Turn signs. Eight signalized intersections where these signs had been installed were studied to determine the effect of the signs on left-turn and U-turn related accidents. The signs reduced left-turn and U-turn related accident rates an average of 63% for the restricted movement, and 66% for the intersection. The decrease in accident numbers paralleled the decrease in accident rates, a 59% reduction for the restricted movement and a 62% reduction for the intersection. Based on the results from the questionnaire and a literature review, guidelines were established to aid traffic engineers in determining where to install these signs.

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• Record URL:
  https://rosap.ntl.bts.gov/view/dot/19364
• Corporate Authors:

  Virginia Transportation Research Council

  530 Edgemont Road
  Charlottesville, VA  United States  22903

  Virginia Department of Transportation

  1401 East Broad Street
  Richmond, VA  United States  23219

  University of Virginia, Charlottesville

  Center for Transportation Studies, P.O. Box 400742
  Charlottesville, VA  United States  22904-4742
• Authors:
  • Brich, S C
  • Cottrell Jr, B H
• Publication Date: 1994-7-27

Language

• English

Media Info

• Features: Appendices; Figures; References; Tables;
• Pagination: 48 p.

Subject/Index Terms

• TRT Terms: Crash rates; Data collection; Guidelines; Guides to the literature; Impact studies; Literature reviews; Questionnaires; Signalized intersections; Surveys; Traffic safety; Utilization
• Uncontrolled Terms: Reduction (Decrease)
• Old TRIS Terms: No left turn signs; No u-turn signs
• Subject Areas: Highways; Operations and Traffic Management; Research; Safety and Human Factors; I73: Traffic Control; I81: Accident Statistics;

Filing Info

• Accession Number: 00664330
• Record Type: Publication
• Report/Paper Numbers: VTRC 95-R5, Proj No. 9106-030
• Contract Numbers: 23.7.110
• Files: NTL, TRIS, STATEDOT
• Created Date: Aug 17 1994 12:00AM