To quote the rool:

"19.HIKE-BIKE TRAILSWhenever a usable and designated path has been pro- vided near a roadway, cyclists, hikers, joggers, runners andin-line skaters shall use that path and shall not use theroadway. However, the speed limit on the hike-bike trailsis 10 miles per hour, so cyclists riding at faster speeds shalluse the roadway. Bicyclists shall yield the right of way topedestrians and shall give an audible signal before overtaking and passing a pedestrian. Users of hike-bike trails shallobey all other posted regulations. Helmets are required onKensington trails and the use of protective equipment isencouraged on all Metropark trails."

While that appears to say that you can use the road if you are going more than 10 miles per hour, I have had a "difference of opinion" with their enforcement personnel on that point. It seems the rool means whatever they want the rool to mean on any given day.