Lake Mead's roads are used by vehicles, bicycles, walkers and even wildlife. Obey posted speed limits. Seat belts or child safety seats are required for all occupants in a vehicle and failure to use them is a primary offense in the park. Drive only on paved roads or unpaved approved roads signed with yellow arrows. Don't drink and drive. For your safety, rangers enforce laws against alcohol and drug-related driving offenses, including open container violations. Even though marijuana is legal in the state of Nevada, Lake Mead National Recreation Area is federal land and it is outlawed within the park's boundaries.