California Code, Public Resources Code - PRC § 5075.5

The director shall prepare a guidebook or guidebooks, including trail maps, describing the system.  The guidebook, or guidebooks, shall include information regarding the responsibility of trail users and shall specify rules and regulations for trail use, including measures designed to prevent trespass and damage to public and private property.  The director may prepare a combined heritage corridors and accessible trails guidebook.  However, the director shall prepare no guidebook or guidebooks of heritage corridors until such time as he determines that the department has available to it adequate volunteers, funds, or a combination thereof, to prepare such guidebook or guidebooks, or until such time as the Legislature appropriates funds sufficient to prepare the guidebook or guidebooks, whichever occurs first.