It is illegal to dispose of anything out of your car window in Washington state. Even something as seemingly harmless as an apple core can affect safety on the highway when if comes to animals and roadkill.
Drivers can receive tickets on private property in Washington, even for failure to have insurance. Most traffic violations apply when a driver is on a public roadway, but some traffic laws apply statewide.
At an intersection, after stopping at the stop line or behind the crosswalk without pedestrians, is it legal for a driver to pull forward to improve visibility, even if they end up blocking the crosswalk?
Despite what the Road Runner did in old cartoons and what many drivers practice, there is no provision for mad honking in the law. It doesn’t tend to fix anything, and generally just makes road safety worse.
Washington state law requires cyclists obey the rules of the road when they ride on public streets, which includes riding on the right side of the road. This is a safety issue for both those on bicycles and cars.
Just because alcohol is served on Washington state ferries, that doesn’t mean people aren’t over-consuming on their ferry rides or that the state approves of driving while impared. But, B.C. ferries just say no.