Well, take US50, a highway between Lake Tahoe and Sacramento. There are many, many long stretches of double yellow and there are several passing lane sections. I don't pass on double yellows for three reasons (ir order of improtance): 1) this might set a very bad example for other motorists and who may be not be as capable and subsequently risk their/other's (including motorcylists!) lives in trying it 2) highway engineers have included several turnouts and passing lane sections and; 3) I can see why engineers double yellowed sections and when I see other motorists who disobey them in a reckless manner it really turns me off, so much that I don't want to be associated with the practice....even though it might be safe.