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Intersection Safety Case Study Summary

This case study summarizes Maryland's experience in implementing roundabouts at rural, two-way, stop-controlled intersections to reduce crashes while maintaining capacity. The study showcases the effectiveness of roundabouts in reducing fatal, injury, and total crashes, with specific examples and data.

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Intersection Safety Case Study Summary

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  1. Intersection Safety Case Study Summary Roundabouts: Maryland Experience A Maryland Success Story FHWA-SA-09-018

  2. The Challenge In 2008, in the United States, 733,000 injury crashes and 7,196 fatal crashes, occurred at intersections1. It is estimated that more than 70% of the fatal crashes occur at stop-controlled intersections. Maryland State Highway Administration (MDSHA) sought to reduce the number and severity of crashes at rural, two-way, stop-controlled intersections while maintaining capacity and cutting down on costs. 1. 2008 Traffic Safety Facts Annual FARS, National Highway Traffic Safety Administration

  3. Solution Conversion to Roundabouts: • Cearfoss Roundabout, Washington County, MD • Lisbon Roundabout, Howard County, MD • Lothian Roundabout, Anne Arundel County, MD • Taneytown Roundabout, Carroll County, MD • Leeds Roundabout, Cecil County, MD Lisbon Roundabout Leeds Roundabout

  4. Technical Data • Location: • 5 high crash locations in Maryland • Speed Limits: • Ranged from 25 mph to 50 mph • Implementation Cost: • $194,000 – $500,000 • Implementation Time: • 6 to 9 months • Implementation Issues: • Maryland experienced no implementation issues with these countermeasures

  5. Results at Treated Intersections • Crash Reductions: • 100% reduction in fatal crashes per year • 88.0% reduction in injury crashes per year • 69.1% reduction in total crashes per year

  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: Mike Niederhauser Maryland State Highway Administartion, Office of Traffic and Safety, Hanover, MD Phone: (410) 787-5879 E-mail: mniederhauser@sha.state.md.us Ed Rice Intersection Safety Team Leader, FHWA Office of Safety Phone: (202) 366-9064 E-mail: ed.rice@dot.gov

  7. Roundabout Backup Slides

  8. Crash reduction of 76.5 percent. Reduced injury crashes by 93.8 percent per year. Fatal crashes were eliminated. Cearfoss Roundabout, Washington County

  9. Crash reduction of 84 percent Reduced injury crashes by 92.2 percent per year. No fatal crashes have occurred. Lisbon Roundabout, Howard County

  10. Crash reduction of 49.6percent Reduced injury crashes by 79.2 percent per year. Fatal crashes were eliminated. Lothian Roundabout, Anne Arundel County

  11. Taneytown Roundabout, Carroll County • Crash reduction of 82.1 percent • Reduced injury crashes by 89.3 percent per year. • No fatal crashes have occurred.

  12. Crash reduction of 46.8 percent Reduced injury crashes by 93.1 percent per year. No fatal crashes have occurred. Leeds Roundabout, Cecil County

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