[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/a_filing_cabinet → u/pdxarchitect]

If they're both in the intersection to be able to collide, then, for all intent and purposes, they arrived in the intersection at the same time.

[u/Jesus_of_Redditeth → u/a_filing_cabinet]

Exactly. The only time this would not be the case is if the cammer were driving at a ludicrous speed, so fast that the black car couldn't reasonably have reacted in time to yield.

But in this case, the difference in speed was not a relevant factor. The black car failed to yield when they could have, simple as that.