I’m a Washington resident and while I don’t have a very strong opinion on this topic, I find @Minh_Nguyen’s arguments (both in this thread and over in the Utah thread) persuasive. It seems that data consumers should (and mostly do) use route relations to figure out what state a highway is in, and shouldn’t be parsing ref tags (since several states already prefer SR or SH in their highway refs instead of the state postal abbreviation). Given that SR is clearly the correct designation according to WSDOT, and also seems to be more commonly used colloquially, I think changing over to using SR in highway ref tags in Washington would be fine, and I wouldn’t oppose someone making the change via mass edit.
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