2. Safety Elements of Modern Roundabout ProWalk/ProBike September 8, 2004 Michael M. Moule, PE, PTOE

4. Weaver Blvd @ UNC-Asheville Main Entrance

6. Crash Statistics - The Netherlands Source: FHWA Roundabout Guide Crash reductions by mode at intersections converted to roundabouts

7. Intersection Size Affects Safety

8. Motor Vehicle Conflict Points 4-way intersection Roundabout Source: FHWA Roundabout Guide

9. Motor Vehicle Conflict Points 4-way intersection 4-way IntersectionRoundabout 32 total conflicts8 total conflicts Source: FHWA Roundabout Guide

10. Motor Vehicle Conflict Points 4-way intersection 4-way IntersectionRoundabout 32 total conflicts8 total conflicts 8 merging conflicts4 merging conflicts 8 diverging conflicts4 diverging conflicts Source: FHWA Roundabout Guide

11. Motor Vehicle Conflict Points 4-way intersection 4-way IntersectionRoundabout 32 total conflicts8 total conflicts 8 merging conflicts4 merging conflicts 8 diverging conflicts4 diverging conflicts 16 crossing conflicts0 crossing conflicts Source: FHWA Roundabout Guide

12. Motor Vehicle Conflict Points 4-way intersection 4-way IntersectionRoundabout 32 total conflicts8 total conflicts 8 merging conflicts4 merging conflicts 8 diverging conflicts4 diverging conflicts 16 crossing conflicts0 crossing conflicts High Speed, High Angle Crashes Low speed, Low angle crashes Source: FHWA Roundabout Guide

13. Motor Vehicle Crash Statistics Source: FHWA Roundabout Guide

14. Motor Vehicle Crash Statistics Source: FHWA Roundabout Guide

15. Pedestrian Conflict Points Source: FHWA Roundabout Guide

16. Peds threatened from afar by high-speed Red Light Runners Red lights Ped threatened from behind by left-turning vehicle Ped threatened from behind by right-turning vehicle Ped threatened by vehicle turning right on red

17. Pedestrian Conflict Points 4-way intersection 4-way IntersectionRoundabout 16 conflicts8 conflicts Source: FHWA Roundabout Guide

18. Pedestrian Conflict Points 4-way intersection 4-way IntersectionRoundabout 16 conflicts8 conflicts High Speed CrashesLow speed crashes Source: FHWA Roundabout Guide

19. Speed & Pedestrian Crash Severity

20. Pedestrian Crash Statistics Great Britain Source: FHWA Roundabout Guide

21. Bicycle Conflict Points 4-way Intersection Source: FHWA Roundabout Guide Conflicts in common with motor vehicles Conflicts unique to bicycles

22. Bicycle Conflict Points Roundabout Source: FHWA Roundabout Guide Bicyclist traveling as a pedestrian Bicyclist traveling as a vehicle

23. Bicycle Conflict Points 4-way intersection 4-way IntersectionRoundabout Left turn: 8 veh. confictsLeft turn: 5 veh. conficts Left turn: 2 ped conflicts Source: FHWA Roundabout Guide

24. Bicycle Conflict Points 4-way intersection 4-way IntersectionRoundabout Left turn: 8 veh. confictsLeft turn: 5 veh. conficts Left turn: 2 ped conflicts Through: 6 veh. conflctsThrough: 4 veh. conflcts Through: 2 ped conflicts Source: FHWA Roundabout Guide

25. Bicycle Conflict Points 4-way intersection 4-way IntersectionRoundabout Left turn: 8 veh. confictsLeft turn: 5 veh. conficts Left turn: 2 ped conflicts Through: 6 veh. conflctsThrough: 4 veh. conflcts Through: 2 ped conflicts High Speed, High Angle Crashes Low speed, Low angle crashes Source: FHWA Roundabout Guide

26. Bicycle Crash Statistics Great Britain Source: FHWA Roundabout Guide Crashes per million trips

27. Crash Statistics - France Source: FHWA Roundabout Guide

28. Crash percentage per type of user - France Source: FHWA Roundabout Guide

29. Crash Statistics - The Netherlands Source: FHWA Roundabout Guide Crash reductions by mode at intersections converted to roundabouts

30. “No design can be made idiot proof. ”

31. 4-way Intersection 32 conflict points  High speed impacts  High angle impacts

32. Roundabout 8 conflict points 75% reduction in Motor Vehicle conflicts  Low speed impacts  Low angle impacts

33. Questions? Michael M. Moule, PE, PTOE moule@livablestreetsinc.com (813) 221-5223 www.livablestreetsinc.com