Over the course of my life I have seen many kinds of crossing signs. When I go to a college campus I drive past a wildlife sanctuary where a duck crossing sign is posted. Each spring mama ducks line up near their sign and lead their babies across the road while the cars waited. There were lots of ducks and some days the wait for motorists can be up to ten minutes. Every winter when I drive along a county highway to visit a friend I see a snowmobile crossing sign. A snowmobile trail is on one side of the