You guys missed my point, I never said the sledder was not at fault, this post is about vehicles, or things that are on GOOMED trails that generally are NOT expected to be or are NOT ALLOWED TO BE and are tearing up the groomed trails and the laws or regs pretaining to what can or can NOT be on the system. My point with the horses were 1 (safety ever been around spooked or startled horses?) I don't care how fast or slow you are going on a GROOMED trail the two users coming together unexpectedly can cause issues, same could be said for a stuck vehicle sidways in the trail and someone traveling down and unexpectidly encountering it, in the eastern Idaho case a horse was killed and sled totaled. 2 (Horses do not float on snow!!) Have you ever riden on a groomed trail after 3 ro 4 horses have gone up it? They tear the crap out of the groomed trail much like a wheeled vehicle would. Who pays for the grooming, not the wheeled vehicle or in my example the horseback rider, no it is the USERS "US". Look if other users such as wheeled vehicles or HORSES for that matter want to contribute to the groomed system fine so be it put signs up notifiying all who could be expected on the trail but if there are rules against vehicles or other objects that are not either designed for use on the snow then they should be held accountable and should pay for the repair (regrooming) part of the trail they runined.