290 likes | 474 Views
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.
E N D
Roundabout Corridors and GatewaysNortheast 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
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)
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”
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
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