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Road Diets and Roundabouts

Road Diets and Roundabouts. Paul Zykofsky, AICP Local Government Commission Sacramento, CA. “Classic Road Diet”. 4 to 3 lanes. San Antonio TX. Median. Bike Lanes. On-street parking. Center Turn-Lane. Road diets: reclaim street space for other uses. Seattle WA.

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Road Diets and Roundabouts

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  1. Road Diets and Roundabouts Paul Zykofsky, AICP Local Government Commission Sacramento, CA

  2. “Classic Road Diet” 4 to 3 lanes San Antonio TX

  3. Median Bike Lanes On-street parking Center Turn-Lane Road diets: reclaim street space for other uses Seattle WA

  4. 3 crash types can be reduced by goingfrom 4 to 3 lanes: 1 – rear enders X Road Diets and Traffic Operations

  5. 3 crash types can be reduced by goingfrom 4 to 3 lanes: 2 – side swipes X Road Diets and Traffic Operations

  6. 3 crash types can be reduced by goingfrom 4 to 3 lanes: 3 – left turn/broadside X Road Diets and Traffic Operations

  7. Road Diets in Seattle(4 to 3 lanes)

  8. Benefits of road diets for bicyclists and pedestrians? • Provide space to add bicycle lanes • Reduce crossing distance • Eliminate or reduce “multiple threat” crash types • Install crossing island to cross in 2 simple steps • Reduce top end travel speeds • Buffer sidewalk from travel lanes (parking or bike lane) • Reclaim street space for “higher and better use” than moving peak hour traffic

  9. Before Charlotte NC

  10. After Before Reclaiming road space creates room for bicycle lanes and pedestrian islands Charlotte NC

  11. Case study: Edgewater Drive Resurfacing Project (Orlando, FL) • $589,000 project scheduled in FDOT 5-year work plan • FDOT open to 3-lane option if City takes over jurisdiction • Changes must be accepted by neighborhood and business associations; before/after studies Before Concept

  12. Reality: Before

  13. Reality: After

  14. Before/after studies: 1. Crash rate 34% Reduction 1 crash every 2.5 days 1 crash every 4.2 days (146 per yr) (87 per yr)

  15. Before/after studies: 2. Injury rate 68% Reduction 1 injury every 9 days 1 injury every 30 days (41 per yr) (12 per yr)

  16. Before/after studies: 3. Speeding analysis

  17. Before/after studies: 4. Traffic volumes Now 21,000+

  18. Before/after studies: 5. On-street parking utilization

  19. Before/after studies: 6. Pedestrian volumes 23% Increase

  20. Before/after studies: 7. Bicyclist volumes 30% Increase

  21. Road Diet — Before Pottstown, PA

  22. Road Diet — After Pottstown, PA

  23. There’s potential on one-way streets too: Is this street operating at capacity? Boise ID

  24. Road Diet on one-way street: This area was recaptured from a 4th travel lane; the street took on a whole new life Portland OR

  25. 68 Feet La Jolla Boulevard, Bird Rock, San Diego, California Before

  26. 14 Feet La Jolla Boulevard, Bird Rock, San Diego, California After

  27. La Jolla Boulevard, Bird Rock, San Diego After

  28. La Jolla Boulevard, Bird Rock, San Diego After

  29. Roundabouts Benefits: Injuries and crashes reduced 90% 30% more traffic capacity Gateway entry Pedestrian-friendly Low traffic speeds Reduced noise Reduced emissions Reduced maintenance Business-friendly

  30. Roundabout design characteristics Separated sidewalk to direct peds to crosswalks Slow speed exit Splitter island Truck apron Lots of deflection for slow speeds throughout Crosswalk 1 car length back Slow speed entry with yield Bend OR

  31. Roundabouts are safer 32 vehicle-to-vehicle conflicts 24 vehicle-to-pedestrian conflicts “Results of this study indicate that converting conventional intersections from stop sign or traffic signal control can produce substantial reductions in motor vehicle crashes.” March 2000 Study by the Insurance Institute for Highway Safety 8 vehicle-to-vehicle conflicts 8 vehicle-to-pedestrian conflicts

  32. Before One pedestrian fatality per year Bradenton Beach, FL, Intersection of State Routes 684 and 789 After Zero pedestrian fatalities in over 8 years

  33. Roundabouts and Pedestrians

  34. 18 mph 18 mph

  35. 14 feet Grand Junction, Colorado

  36. Sacramento, CA West River Drive and Orchard Lane

  37. Sacramento, CA West River Drive and Orchard Lane

  38. Roundabouts and Bicyclists

  39. Montpelier, VT

  40. University Place, WA

  41. Davis, CA

  42. Roundabouts, Trucks and Fire Departments

  43. Petaluma, CA — Roundabout at Corona Road and Sonoma Mountain Parkway

  44. Roundabout Fire Station #2, 1001 N. McDowell Blvd. Petaluma, CA — Roundabout at Corona Road and Sonoma Mountain Parkway

  45. Mountable Curb for large trucks, emergency responders Petaluma, CA — Roundabout at Corona Road and Sonoma Mountain Parkway

  46. Mountable Curb can be used by large trucks, emergency responders Fort Pierce, FL

  47. Roundabout problems for blind pedestrians: • Circulating traffic masks the sound cues the blind use to identify gaps and masks the sound of yielding vehicles • Tangential circulating roadway, tangential exit => high speed (worse at 2-lane roundabouts) Towson MD 8-50

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