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Roundabout Corridors and Gateways Northeast Roundabout Peer Exchange

Roundabout Corridors and Gateways Northeast Roundabout Peer Exchange . Brian Walsh, P.E. Washington State DOT. What constitutes a Corridor?. Number of roundabouts? Original project as defined by a planning study? The length of the project that results in access control or managed access.

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Roundabout Corridors and Gateways Northeast Roundabout Peer Exchange

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  1. Roundabout Corridors and GatewaysNortheast Roundabout Peer Exchange Brian Walsh, P.E. Washington State DOT

  2. What constitutes a Corridor? • Number of roundabouts? • Original project as defined by a planning study? • The length of the project that results in access control or managed access

  3. Known Corridors with Multiple Roundabouts in Series • Golden, CO (South Golden Road) • Sedona, AZ • Billings, MT (Shiloh Road) • Malta, NY • San Diego, CA • Lynden, WA (Guide Meridian) • Gig Harbor, WA (Borgen Boulevard)

  4. Important Metrics in Developing Roundabout Corridors • Managing Access • Crash Reduction • Safe Intersection Control • Travel Time Improvements (all hours of day) • Ability to shrink footprint of the “link”

  5. South Golden Road

  6. Guide Meridian • Scoped Originally as a 4 lane divided with Signals • Scope was change in 2005 to be roundabouts • ADT was in the 16,000 range however community had been promised what we would consider an expressway • Roundabouts went through a extensive but successful public input process

  7. Guide Meridian

  8. Conceptual

  9. Woodinville

  10. Olympia

  11. Analogy • The old adage was “Link is the meat, Node is the vegetable” • The new adage should/shall be “Node is the meat and the vegetable, link is dessert

  12. State DOT Gateway

  13. SR 903/Bullfrog Road – Cle Elum (built 2005)

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