Big Rig Collision on State Route 18 Led to Injury [King County, WA]

King County, WA (August 15, 2026) — On Friday morning, a motorcycle passenger suffered serious injuries after a frightening collision on State Route 18 near the Tiger Mountain Summit in King County, Washington.

The crash occurred in the eastbound lanes west of the summit and temporarily blocked traffic in both directions. The Washington State Department of Transportation reported the closures around 8:45 a.m.

Investigators said the semi and motorcycle collided, sending the motorcycle into a roadside barrier. The injured passenger received emergency medical attention.

Westbound lanes reopened shortly after the crash, while crews restored eastbound traffic by about 10 a.m. Authorities continue to investigate the circumstances surrounding the collision.

Let’s Avoid Traffic Accidents

Avoiding auto accidents involves paying attention and practicing safe driving methods. And as always, you should follow the speed and traffic laws, and don’t text (or use your phone in any way) behind the wheel.

Keep a safe trailing distance to be able to stop, if necessary.

Do not drink and drive, and never get behind the wheel if you are under the influence of alcohol or drugs, or if you are tired.

Watch your mirrors, use your turn signals, and check your blind spots before changing lanes or making a turn. Drive calmly and patiently, especially in heavy traffic or bad weather.

When you drive responsibly and remain alert, you help prevent accidents and keep everyone on the road safe.

Drivers should remain alert when entering roadways and always yield to pedestrians at crossings. Pedestrians can also improve their safety by staying visible and remaining aware of nearby traffic. Exercising caution can help prevent serious collisions and save lives.

Motorcycle crashes can cause severe injuries even when riders wear protective gear. If you were injured in a collision, seek medical care promptly and consider speaking with a personal injury attorney about your rights.

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Traffic accidents can leave lasting physical, emotional, and financial impacts. If you or a loved one has been injured in a car, truck, or bicycle accident caused by someone else, it can feel overwhelming to know where to start. Sweet Lawyers is here to guide you every step of the way.

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If you’ve been injured in a traffic accident, speak with Sweet Lawyers today. Call (800) 674-7852 or visit our website to learn more about filing a personal injury claim.