Then there is just the general quality of the experience for the Hiker. My feeling is that there should be areas where there is separation, less emphasis on multi use trails. That has happened in some places, down in south Monterey county in a place called Garland Park. They have actually allotted an area for people to ride bikes. If you want to ride a bike and do all the acrobatic and other things which a lot of riders like to do, they can do it there and they won't interfere or jeopardise other users, Hikers, or horseback riders for that matter.
Horseback riders seem to have mixed feelings on the matter.
Some don't mind, whereas others feel quite strongly on the matter, that their horses and their safety is affected by bikes. I favour separation of users. I've also seen bicycles and bike riders who will ride anywhere, I don't know what the proportion is. They don't even stay on the designated authorised trails, they go across country. I've seen photographs taken at Wilder Ranch of bicycles riding down the stream bed.