Some mountain bikers are still dissatisfied with the draft management plan for open space preserves and are asking that evaluation of trails and future improvements include the positive impacts bikers provide, including getting people—in some cases, young people—off dangerous roads. Others suggest that bikers be allowed to ride on narrow trails—currently they are allowed on only four such trails—because they ride more slowly and therefore contribute less to erosion and do less damage to natural resources. County parks officials say they’re through with revisions, but that future community meetings will invite input on specific trails and their best uses. David Briggs