Intersection Safety Case Study Summary Stop SignControlled Intersections

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Intersection Safety Case Study Summary 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-09010

The Challenge • One-third of all intersection crashes in the United States, and 40

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

Solution Enhanced Stop Signs and Pavement Markings: 1. Larger (30 -inch) stop signs with

Solution Enhanced Stop Signs and Pavement Markings: 1. Larger (30 -inch) stop signs with “Stop Ahead” advance traffic control sign and added pavement markings (double-yellow centerline and stop bars) 2. Added pavement markings (double-yellow centerline and stop bars) to existing (24 -inch) stop signs 3. Additional and larger (30 -inch) stop signs 4. Additional and larger (30 -inch) stop signs and added pavement 2

Technical Data Location: – 16 high crash locations in the City of Winston-Salem, North

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

Results at Treated Intersections Average Crash Reductions: – 70% reduction in injuries per year

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

For More Information • Visit FHWA’s intersection safety web site to download this and

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 Ed Rice Director of Transportation City of Winston-Salem, NC Intersection Safety Team Leader FHWA Office of Safety Phone: (336) 747 -6867 E-mail: stanp@cityofws. org Phone: (202) 366 -9064 E-mail: ed. rice@dot. gov 5