Why traffic stinks in Kent: Septic truck overturns on SR-167

KENT, Wash. -- You might think rush hour traffic stinks in the Puget Sound area, but for those commuters who use SR-167 near Kent, it was literal Wednesday afternoon.

A septic tanker truck overturned on the road near the Willis Street/SR-516 ramp around 3:30, leaking its... contents onto the roadway.

"Oil, fuel and mmmm, some other yucky stuff spilled," Trooper Chris Webb tweeted.

The State Patrol said the truck collided with three other vehicles but there were only minor injuries. The backup was at least four miles at the peak of the incident.

WSDOT took to Twitter to warn drivers of their impending challenge:

What's that smell on SR 167, you ask? You don't want to know... MT @wsdot_traffic Overturned truck is a septic truck

Washington State DOT (@wsdot) April 30, 2014

Planning on driving SB 167? Might wanna pack a nose plug & left arm sunscreen. MT @wsdot_traffic Backup on SB SR 167 at SR 516 is 2 miles.

Washington State DOT (@wsdot) April 30, 2014>

Here's another look at the overturned septic tank SB 167 at SR 516. Yes, it spilled. Yes, it's gross.

WSDOT Traffic (@wsdot_traffic) April 30, 2014There is no word yet what caused the crash.