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Stop Sign-Controlled Intersections: Enhanced Stop Signs and Pavement Markings

Intersection Safety Case Study Summary. Stop Sign-Controlled Intersections: Enhanced Stop Signs and Pavement Markings. A Winston-Salem Success Story. FHWA-SA-09-010. The Challenge.

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Stop Sign-Controlled Intersections: Enhanced Stop Signs and Pavement Markings

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  1. Intersection Safety Case Study Summary Stop Sign-Controlled Intersections:Enhanced Stop Signs and Pavement Markings A Winston-Salem Success Story FHWA-SA-09-010

  2. The Challenge • One-third of all intersection crashes in the United States, and 40 percent of all fatal crashes, occur at intersections controlled by stop signs.1 • Driver failure to see the stop sign and/or know where to stop are common problems. • City of Winston-Salem sought simple,low-cost safety treatments to increase driver compliance with the stop signs, and reduce the number and severity of crashes at high-crash stop-controlled intersections. 1. Insurance Institute for Highway Safety, Volume 37, No 9, October 26, 2000. 1

  3. Solution Enhanced Stop Signs and Pavement Markings: Larger (30-inch) stop signs with “Stop Ahead” advance traffic control sign and added pavement markings (double-yellow centerline and stop bars) Added pavement markings (double-yellow centerline and stop bars) to existing (24-inch) stop signs Additional and larger (30-inch) stop signs Additional and larger (30-inch) stop signs and added pavement markings (double-yellow centerline and stop bars) 2

  4. Technical Data Location: • 16 high crash locations in the City of Winston-Salem, North Carolina Speed Limits: • Ranged from 25 mph to 45 mph Implementation Cost: • $350: 30-inch stop sign or “Stop Ahead” advance traffic control sign • $1,250: Pavement markings (double-yellow centerline and stop bar) Implementation Time: • 3 months Implementation Issues: • Winston-Salem experienced no implementation issues with these countermeasures. 3

  5. Results at Treated Intersections Average Crash Reductions: • 70% reduction in injuries per year • 55% reduction in total crashes per year • These intersections did not experience a significant number of fatalities. 4

  6. For More Information • Visit FHWA’s intersection safety web site to download this and other case studies highlighting proven intersection safety treatments from across the country: http://safety.fhwa.dot.gov/intersection • Or Contact: Stanley F. Polanis Director of Transportation City of Winston-Salem, NC Phone: (336) 747-6867 E-mail: stanp@cityofws.org Ed Rice Intersection Safety Team Leader FHWA Office of Safety Phone: (202) 366-9064 E-mail: ed.rice@dot.gov 5

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