I'm not sure if it's the same in all states but the ones I've lived in the law reads that bikes have the same rights and are subject to most of the same laws as cars. Unfortunately most drivers missed that section of drivers ed.

I'm thinking a jersey/t-shirt with the state regulation written across the back in big red print. Kind of like a 'baby on board' stick up in a car...

Something simple... for me it would be:


MASS STATE LAW

Rules of the road apply to all drivers, including bicyclists.


Of course that means that those who wear such a shirt need to not blow through stop signs, inch up on the right at lights, etc... not that I'm inferring anyone on this board would do such a thing.