There are many Bridges on U.S.1, including the famous Seven Mile Bridge just south of Marathon Key. Drive with caution on this Highway. When we say unlimited access it means just that. Cars, bikes, R.V.s, and pedestrians are allowed to cross the highway just about anywhere. T he Mile Markers the eqivalent of channel markers planted in the shoulder of the road every mile from the Florida mainland to the mile marker zero in Key West.
People locate themselves by specifying the mile marker plus a fraction of the mile.
I t's just that simple. One lane of U.S. route 1 is closed from 8pm until 6 am daily. To avoid this bottleneck take card sound road from Florida City. Traffic is heavy Southbound on Fridays and Northbound on Sundays. When you party in the Keys, Always follow the Designated Driver Rule and keep a sharp eye for those that don't.