When I was a teenager, a very long time ago. Two friends had car accident's with horses within a month of each other. In both incidents young lads and speed was a factor. One horse was killed out right the other had to be put down. Both riders ended up in hospital, both drivers and a passenger end up in hospital. both cars were total right off's. I never go anywhere near a horse, whether in a car, on a bike or in a truck until I'm sure horse and rider knows I'm there. Once I even stopped my truck, got out and lead the horse past. When those things start up they can do a hell of a lot of damage. Never stand behind one.