Plastic, with blue tape

Below is a link to a plethora of manuals and best practices guides that provide information for trail planning, design, construction, maintenance, operation, and management, and for signs.

These resources are from government agencies or nonprofit organizations. Copies may be purchased or acquired from the sources indicated. U.S. Government publications may be purchased from the U.S. Government Printing Office

http://www.fhwa.dot.gov/environment/recreational_trails/guidance/manuals.cfm