As a Brit, the cavalier attitude to drink-driving in the USA never ceased to amaze me.

Well the cool thing about horses is they're technically self-driving. You can fall asleep on a well-trained horse and it'll get you both home. If you're driving distracted and are headed straight for a tree, the horse typically won't smash itself into a tree. When surrounded by lots of other horses (in a charge, for example), the horses will run as if they were in a herd and won't trample eachother.

>> Motor vehicles are a big cause of death in many countries.

Yep, that is true. On the other hand there are also many laws that try to mitigate the risk of accidents.[] I think the mobility of motor vehicles is a benefit, that outweighs the risk of accidents. I doubt we could manage the logistics of supplying big cities with bikes, trains and horses alone.

[]: That does not solve the problem, that cars are dangerous machinery and some people just shouldn't handle them (despite a drivers license).