My question involves a traffic ticket from the state of: WA

I'm wondering if there are options for contesting based on signage etc? Before he attempts to get it deferred, maybe there's an out? 😁

Yes he knows he's an idiot. Last deferral (and ticket) 9 yrs ago.
He had a physical issue, his right eye as no vision at the moment.

Before he simply attempts to mitigate, just thought I'd check with the experts.

I can't seem to find any legal information on requirements for signage...

Thanks