Moose makes preprinted standard arrows, etc... on cardboard. If your looking for something more permenant talk to a local sign company about doing it on metal or plastic and maybe getting a discount because you let them print their business info on them. We have done this locally and it works well. Just be sure to use what is considered "standard" so people aren't running off cliffs or into trees trying to read them! :laugh:
CLICK W = wrong way (to avoid head on collisions one way trail marking is a great idea!) X = danger XX = higher level of danger <- = left turn -> = right turn
You can even use them in combination such as an "X" and downward arrow to indicate a steep drop off. If you use different colored arrows or cards you can even keep track of what trail you are on in the system.