The Prop. 65 warning to end all Prop. 65 warnings
In California we have something called “Proposition 65” that mandated warning signs wherever there are hazardous substances. You'll get a big fine if you need a sign and you don't have it, but there's no problem if you don't need one but have one anyway, so as a result, you can see these signs everywhere and they've become absolutely meaningless.
Therefore, to reduce our visual clutter and make life easier on everyone, I propose to just put one of these in every port, airport and road entering the State, and get rid of all other signs: