(DC)- July 4, Metro is going fare-free Tuesday evening for the Fourth of July.  Metrorail, Metrobus and MetroAccess will be fare-free on Tuesday, July 4 from 5 p.m. until the system closes, with frequent service to the National Mall and other celebrations across DC.   Metrorail faregates will be open, and fare-free signage will be posted throughout the stations and on buses to communicate that customers do not need SmarTrip cards if using Metro after 5 p.m.