Mountain bikers and self-described “foot people” have clashed in recent months over how much access bikers should have to trails on Marin County’s Open Space Preserves. 

The most recent dispute followed a county workshop in Lagunitas in October, where open space staff solicited input on how to designate usage of around 50 miles of trail on seven preserves in the San Geronimo Valley. Maps released last month show that bicyclists will be able to use…