Hmmm = I'm not sure how horses and vehicles can safely share a trail, but I'm looking forward to seeing the suggestions! Collaboration would be great, for sure!
I wish there were trails around here. I especially like the idea of trails for bikes and horses. I always used to ride my horse with my brother who was riding his bike. It's fun.
Horse and bikes would work to together well. But remember to make sure your horse isn't afraid of them. I have ridden with bikers and it works well.