Maybe no motor vehicle signs should be updated to say no fossil fuel vehicles.

On trails, there is often a sign that says, "no motor vehicles." Now with the advent of electric bikes, skateboards and even wheelchairs, the sign should say, "no fossil fuel vehicles." Electric motors tend to be quiet and okay; especially if the vehicles are not going too far over 15mph. It would be hard to ban motors these days. I'm glad to see them as more people are discovering bicycling.