It is illegal to drive a motorized vehicle in a way that intentionally frightens a horse on the highway.

The Law Explained

Written during the awkward transitional period between horse-drawn carriages and early automobiles, this traffic law was designed to prevent chaos on the roads. Early cars were loud, backfiring beasts that easily spooked livestock. Drivers are legally mandated to slow down, avoid revving their engines, and take every precaution not to incite panic in a horse sharing the road.