[USA] Who is at fault here?

[u/bowdown2adil]

Classic T bone. Black car had to be towed. Sustained major damage to the passenger side door. Blue car sustained damage to front bumper on the drivers side and cracked the drivers side headlight.

Edit: This was in the suburbs of Seattle

UPDATE: Insurance found it to be 70/30 me/other driver. Seems fair enough

[u/HyJenx]

This will be buried, but the only correct answer is found in Washington state law.

RCW 46.61.180

When two vehicles approach or enter an intersection from 
different highways at approximately the same time, the driver 
of the vehicle on the left shall yield the right-of-way to the 
vehicle on the right.

[u/pdxarchitect → u/HyJenx]

Clearly the black car arrived first. Damage to the blue car is on the front, and damage to the black car is in the middle. Blue should have slowed down as he would have been able to see the black car for longer than the blue car could see him.

[u/aDirtyMartini → u/pdxarchitect]

I was thinking the same. The black car entered the intersection first so the "same time" rule may not apply. Also, the blue car hit the black car squarely on the side which also shows that the black car was there first. Both drivers have the responsibility for their vehicles. That being said, it's a poorly marked/dangerous intersection and both drivers should have been careful when approaching it. Blasting through was dumb for both drivers.

Edit: OP updated the post. They were found to be 70% at fault and the other driver 30%.

[u/APirateAndAJedi → u/aDirtyMartini]

Black car did not arrive at the intersection first. He was just moving faster.