It is unlawful to test the speed of a horse on a public highway.

The Law

Before cars dominated the roads, equestrian drag racing was a real public safety hazard in bustling colonial towns. To prevent pedestrians from being trampled by impromptu horse races, the state banned speed-testing your steed on main roads. Today, the exact same legal principle applies to racing your sports car. It serves as a funny historical bridge between literal horsepower and mechanical horsepower.