Interstate 405
Tukwila, WA to Lynnwood, WA — Seattle Eastside Corridor
Interstate 405 runs 31 miles along the eastern side of Seattle through Renton, Bellevue, Kirkland, and Bothell before reaching Lynnwood. Despite its short length, I-405 carries enormous traffic volumes as the primary north-south alternative to I-5 for the Seattle metro's Eastside tech corridor. Hills, curves, complex interchanges with I-90 and SR-520, and extreme congestion create a high-risk environment for commercial vehicles. Rain-slicked roads, distracted tech-sector drivers, and speed variability from stop-and-go to 70 mph in short stretches compound the inherent geometric challenges.
Length
31 miles
31 miles
Risk Rating
HIGH
HIGH
Risk Factors
Extreme traffic density in tech corridor
Hills and curves limiting sight distances
Complex I-90/I-405 and SR-520/I-405 interchanges
Rain-slicked pavement year-round
High speed variability (stop-and-go to 70 mph)
Distracted driving in high-smartphone-use commuter population
Notorious Segments
- I-405/I-90 interchange (Renton)
- SR-520/I-405 interchange (Bellevue)
- Renton S-curves
Connected Hubs
Regions
United States
West
Washington