EFFECT OF RIGHT TURNING VEHICLES ON TRAFFIC SIGNAL VOLUME WARRANTS. STATE OF THE ART. FINAL REPORT

Nationally accepted traffic signal warrants are provided in the Manual on Unifrom Traffic Control Devices (MUTCD). There are 11 warrants recommended in the MUTCD; four of these are vehicular volume related warrants. These warrants are: Warrant No. 1 - Minimum Vehicular Volume; Warrant No. 2 - Interruption of Continuous Traffic; Warrant No. 9 - Four Hour Volume; and Warrant No. 11 - Peak Hour Volume. In all four of these warrants the minor street minimum hourly volume is defined. This volume is the total volume of right turn, through, and left turn movements from the minor street approach. A recent change to the MUTCD states that a portion of the right turn volume may be deducted from the total minor street approach volume: "The analysis should consider the effects of the right turn vehicles from the minor street approaches. Engineering judgmment should be used to determine what, if any, portion of the right turn traffic is subtracted from the minor street traffic count when evaluating the count against the above warrants." This study: 1) developed a state-of-the-art report on the topic of "Effect of Right Turning Vehicles on Traffic Signal Volume Warrants"; 2) recommended that further research be done leading to the development of guidelines for excluding or including right turning vehicles in the total approach volume for evaluation of the need for a traffic signal; and 3) developed a research work plan for the future.

  • Corporate Authors:

    Arizona State University, Tempe

    Center for Advanced Research in Transportation
    Tempe, AZ  United States  85287

    Arizona Department of Transportation

    206 South 17th Avenue
    Phoenix, AZ  United States  85007

    Federal Highway Administration

    1200 New Jersey Avenue, SE
    Washington, DC  United States  20590
  • Authors:
    • Radwan, A E
    • Upchurch, J E
  • Publication Date: 1987-10

Media Info

  • Pagination: 33 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00622385
  • Record Type: Publication
  • Source Agency: Federal Highway Administration
  • Report/Paper Numbers: FHWA-AZ87-821
  • Contract Numbers: PL-1(31) Item 821
  • Files: TRIS, USDOT, STATEDOT
  • Created Date: May 31 1992 12:00AM