Issaquah Hobart Road Corridor Study

GMVUAC PresentationJune 1, 2009

David Mark and Jim Ishimaru Road Services Division

King County Department of Transportation

Study Area Boundary

Study Purpose:Analyze existing and future traffic conditions

along the Issaquah-Hobart Road CorridorDevelop short & long term Transportation

project recommendations, consistent with Comprehensive Plan policy direction

Use a new subarea traffic model to test different “what if” scenarios

Establish an Interagency Technical Advisory committee to help finalize recommendations

Current Conditions and IssuesIssaquah-Hobart Road functions as an Urban

Connector with unique rural characteristicsFrequent accidents along entire length of

Issaquah-Hobart RoadSafety/parking issues near hang-glider areaSlow-moving commute traffic Intersection delay at SE May Valley Road &

Cedar Grove Road intersectionsFifteen mile creek bridge needs replacement

Issaquah- Hobart Road: Accident data, 2004-2007

Future traffic issues / deficiencies

Project Recommendations - Short termInstall No Parking signs near Hang Glider

ParkInstall traffic cameras at Cedar Grove Road

and May Valley Road intersections to monitor traffic conditions

Install digital message sign near SE Mirrormont Blvd

Interconnect signals at Cedar Grove Road and May Valley Road to allow intersections to be controlled at traffic center

Review for possible new warning signs at high accident locations

Initial Project Recommendations – Long termComplete SR-18 widening from Issaquah-Hobart Road

to I-90Replace Fifteen mile creek Bridge Expand existing Hang glider parking lotConstruct roundabouts at intersections with May

Valley Road & Cedar Grove RoadImprove channelization from May Valley Road to

Issaquah City LimitsInstall fiber optics, flood sensors and weather station

in the corridor

Next stepsWork to include project recommendations in

our Six Year Capital Improvement Program

Work with local jurisdictions and UACs to address other SE King County traffic needs

Comments? Suggestions?Contact:

David Mark, Supervisor, Technical Data Group Phone: (206) 263-6273 Email: david.mark@kingcounty.gov