King County Road Services - Transportation planning and engineering resources

This page is intended to provide quick access to transportation related information needed by planners, engineers, and other professionals developing land in unincorporated King County.

Data

• King County historic traffic counts & traffic data links

Design standards

• King County Road Standards
• King County site engineering, survey & construction
• King County Surface Water Design Manual
• King County Code 21A.18 development standards - parking and circulation
• Washington State Department of Transportation design policy and standards 

King County transportation projects

• Roads Capital Improvement Program design & construction projects
• Transportation Needs Report

Maps, property descriptions, survey data

• Arterial Classification System for Unincorporated King County
• Road Services Division Map Counter
• King County Department of Assessments
• King County GIS Center
• Natural Resources reference maps
• Zoning atlas

Regulations, permits, policies

• Transportation Concurrency Management Program and Certificate of Concurrency Application
• Permits, County Codes and Policies Impacting Land Use
• King County Load-Limited Bridges and Overlegal Permit for Bridge Crossing
• Right of Way Use Permits and Franchises

Road improvement districts, road vacations

• Road improvement districts for unincorporated King County
• Road vacations for unincorporated King County