A handful of Metrobus route and service changes took effect on Sunday, the most notable of which is an increase in the frequency of the 5A line, which travels between L'Enfant Plaza and Dulles Airport. Three westbound and three eastbound buses have been added every weekday, which is good news for anyone who regularly uses the often very crowded 5A. The additional buses will leave D and 7th streets SW at 6:25 a.m., 2:30 and......