Title: Interstate 5 in Washington - Wikipedia
Headings: Interstate 5 in Washington
Interstate 5 in Washington
From Wikipedia, the free encyclopedia
Contents
Route description
Southwestern Washington
South Sound region
Seattle and Shoreline
Snohomish County
Skagit and Whatcom counties
Seattle express lanes
Express lane exit list
History
Early state and national highways
State upgrades and Interstate planning
Suburban and rural construction
Seattle planning and construction
Major projects and expansions
Incidents and closures
Future projects and proposals
Exit list
References
External links

Content: Several of the largest cities along the I-5 corridor are also connected by the parallel Cascades, a regional train service between Eugene, Oregon, and Vancouver, British Columbia, operated by Amtrak and funded by the state governments of Oregon and Washington. I-5 is maintained by the Washington State Department of Transportation (WSDOT), who conduct an annual survey of traffic volume that is expressed in terms of average annual daily traffic (AADT), a measure of traffic volume for any average day of the year. The stretch of I-5 through Downtown Seattle is the busiest highway in Washington state, with a daily average of over 274,000 vehicles in the mainline and express lanes. The least-traveled segment of I-5 is located at SR 548 in Blaine, with a daily average of 6,600 vehicles. I-5 through the Seattle metropolitan area is among the worst congested highways in the United States, with 78 percent of peak direction miles classified as "routinely congested" for seven to eight hours a day and an average annual delay of 55 hours for Seattle– Everett commutes. The freeway has a maximum speed limit of 70 miles per hour (110 km/h) in rural areas and 60 mph (97 km/h) in urban and suburban areas, which includes a 100-mile (160 km) section between Tumwater and Marysville. Southwestern Washington
An Amtrak Cascades train running in the median of I-5 near Kalama. The route of the Cascades generally runs parallel to I-5 within Washington state. I-5 enters Washington on the Interstate Bridge, a pair of vertical-lift bridges that span the Columbia River between Portland, Oregon, and Vancouver, Washington. The bridge is the only point on I-5 where vehicles have to stop for cross traffic, due to the lifts.