At the same time it could become unreasonable for individuals to research all the local ordinances they may encounter in a 20 mile trip.
It is extremely reasonable. Drivers are always responsible to learn the laws of places they drive. Are you only required to follow the law of your plate’s state/province? Is turning right on red in NYC okay if you are plated outside the city?
NY requires each intersections that aren’t Right on Red to be posted at the light. So you know on a turn by turn basis if you’re allowed or not. A noise ordinance isn’t.
In larger areas sure. Knowing those things is reasonable. But if you’re crossing 15 different little municipalities is it reasonable to expect people to look up all the local laws for each of them?