We are developing a new trail system within NYC. We are working on the signage, warnings etc. All our signs will be in english language. There is no way we can accomodate all the various languages.

I was thinking of putting an international symbol for mountain biking that would illustrate the un-even terrain and show use of helmet and pads, danger etc. This would be featured on the kiosk as well as the entrance to the black and double black diamond trails.

Anyone have an example of such a graphic?