I'd be most afraid they'd go down in it.
So it's not powered, it's moved by the horse, but he has brakes?
They'd have a pretty hard time doing it. They're pretty much trussed up in there like a Christmas goose. Hopefully I can get pictures of a horse actually in it. I'll try to get video too.
It's not powered. It's just like having half a wagon hooked to a post and instead of them being out in front of the wheels, they're between them. They pull it around. The seat can be moved to the opposite end too, so the horse can be hitched in there to go around either way. The way it's set up now, you'd be going around counter clockwise.