There are a lot of fire roads on Mt. Tam and in the Marin open spaces that are shared and are totally safe to go more than 15 mph on, although honestly it varie

There are a lot of fire roads on Mt. Tam and in the Marin open spaces that are shared and are totally safe to go more than 15 mph on, although honestly it varies a lot on how windy the road is and what the visibility is. There are also a few narrow trails that are shared and 15 mph seems pretty fast to be going on those. Seems like maybe this should be a 20 or even 25 mph speed limit on the fire roads and then a 10 mph speed limit on the narrow trails? Or they should just make some of the fire roads bike only. There are tons of fire roads out there, it seems like it wouldn't be that hard to find some to dedicate to mountain biking. There are even some that already have parallel hiking-only or hiking/horse trails. P.S. don't ride your bike on hiking only trails. There are bikers who do this (a small minority, but you end up being judged by the worst members of your community, sorry, that's life). This is a dick move, not only because it's dangerous, but because bikes can really tear the trails up and cause erosion.