Motorcyclist seriously injured in hit-and-run on I-405 in Renton

RENTON, Wash. — A motorcyclist was seriously injured after a hit-and-run on I-405 in Renton this morning, according to Trooper Rick Johnson with the Washington State Patrol (WSP).

Trooper Johnson first reported the crash at around 5:45 a.m., informing drivers that the southbound lanes of I-405 near Sunset Boulevard were closed due to a motorcycle vs. car, serious injury, hit-and-run collision.

The crash is being investigated for vehicular assault.

Trooper Johnson says WSP is working on sharing a description of the “running vehicle.”

Here is what the scene looks like. pic.twitter.com/fp2wCE5oNZ
— Trooper Rick Johnson (@wspd2pio) May 13, 2026

As of 6:20 a.m., the Washington State Department of Transportation (WSDOT) reported that just one lane was open, with about 2+ miles of traffic backups.

WSDOT told drivers to expect delays and use alternative routes.

Just before 8 a.m., Trooper Johnson confirmed that all lanes had reopened.

UPDATE: Southbound I-405 is reduced to one lane near Sunset Blvd in Renton due to a collision. We are seeing about 2+ miles of backup at this time.

Expect delays in this area @CityofRenton https://t.co/YAj4CJA0ST pic.twitter.com/MjHwdM6NPl
— WSDOT Traffic (@wsdot_traffic) May 13, 2026