I’d bet if you call, if you can find a number for the local park cops, and ask, they will tell you no bikes.
Reality is they might not even check the roads as they would have to move the barriers to drive and check, thus only if they saw you coming/going would they know.
Your call but I understand. It’s SO tempting knowing there no cars on the road.
They’ll be pissed if you crash and have to call them though....