You can get on a horse, or horse-drawn carriage, completely wasted drunk out of your mind, or high, or just too tired to drive. Tell horse “home” and he will go to the stable he came from, dragging you with it all the way.

Horses are statistically more dangerous than motorcycles (or skiing). I can’t find any statistics on drunk riding because most horse owners aren’t stupid enough to try it, but it seems very likely that riding a horse drunk is way more dangerous than driving drunk.