Adjustments to many District of Columbia Metrobus routes went into effect Sunday. The service changes are being made to accommodate changes in Metrobus ridership patterns or to make the service more efficient, according to the Washington Metropolitan Area Transit Authority.

Route 32--Change in routing. Trips have been extended to 22nd Street and Savannah Street. Minor changes in arrival and departures. Passengers should check new timetables for exact schedule.

Route 42--Change in routing. Eastbound trips operate via the previous route to Massachusetts Avenue and First Street (Union Station Plaza), then turn right on First Street, left on D Street and from there continue the previous route. There is no change in arrival or departure times. There is no change in westbound trips.

Route 46--All weekday trips have been extended to the Kennedy Center and operate until midnight. New Saturday and Sunday service operates from Dupont Circle to the Kennedy Center every 30 minutes between noon and midnight. Check the new timetable for exact schedule.

Routes 50, 52, 54--Minor changes in arrival and departure times. Passengers should check the new timetable for exact schedule.

Routes A1, A2, A3, A4/, A5, A6, A8--Additional trips are operating weekdays on these routes and Saturdays and Sundays on Route A6. Passengers should check the new timetable for exact schedule. Routing changes are also being made on routes A2, A4, A4/, A6 and A8 as follows:

Route A2--Southbound trips operate over their previous route to Eighth and Yuma streets SE, continue on Eighth Street, turn left on Atlantic, bear left on Barnaby Street, turn right on Wheeler Road and continue on the previous route. Northbound trips operate over their previous route to Wheeler Road and Bellevue Street SE, then continue on Wheeler Road, turn left on Barnaby Street, right on Atlantic Street, right on Eighth Street and continue over the previous route. Passengers should check the new timetables for exact schedule.

Routes A4, A4/--Most Route A4 Fort Drum service has been combined with A4/Bellevue service. Bellevue trips operate via Fort Drum before serving Bellevue in the southbound direction and serve Fort Drum after leaving Bellevue in the northbound direction. Check the new timetables for exact schedule.

Route A6--Southbound trips operate over the current route to Wheeler Road and Valley Avenue SE, then turn left on Valley Avenue SE, right on 13th Street, right on Varney Street, left on Wheeler Road and continue over the previous route. Northbound trips operate over their previous route to Wheeler Road and Varney Street, then turn right on Varney Street, left on 13th Street, left on Valley Avenue, right on Wheeler Road and continue over the previous route. Passengers should check the new timetable for exact schedule.

Route A8--Late-night service operates between Archives and Livingston via Route A8 outbound (toward Livingston) and via Route A6 inbound (toward Archives). Passengers should check the new timetable for exact schedule.

Route A9--Changes in arrival and departure times. Passengers should check the new timetable for exact schedule.

Routes H2, H4--Trips have been extended from 31st and Douglas streets NE to the new Goodwill Rehabilitation Center at South Dakota Avenue and V Street NE. Passengers should check the new timetable for exact schedule.

Route L5--Service has been reduced to five trips in the morning and five trips in the evening. In the morning, L5 trips leave Chevy Chase Circle at 7 o'clock, 7:20, 7:45, 8:05 and 8:30. In the evening, trips leave 17th and C streets NW at 4:30, 5, 5:20, 5:40 and 6.

Route M2--Service has been reduced to five trips in the morning and five trips in the evening. In the morning, northbound M2 trips leave 1900 Half St. SW at 6:30, 7, 7:30, 8 and 8:35. In the evening, northbound trips leave Second and V streets SW at 3:55, 4:25, 4:55, 5:25 and 6. Southbound trips leave Union Station at 7 a.m., 7:30, 8, 8:30, 9:05, 3:25 p.m., 3:55, 4:25, 4:55, 5:25, 5:55 and 6:30.

Route V3--Change in routing. Trips operate southbound via previous route to Barnaby and Ninth streets SE, then continue on Barnaby Street, turn right on Wheeler Road and continue on the previous route. Northbound trips operate via the previous route to Wheeler Road and Bellevue Street SE, then continue on Wheeler Road, turn left on Barnaby Street and continue over the previous route. There has been no change in arrival or departure times.

Route W4--Change in routing. Trips operate straight along Division Avenue instead of previous route via Fitch Place, 51st Street and Blaine Street. There has been no change in arrival or departure times.

Routes X2, X4--New Saturday and Sunday schedules are in effect. There has been no change in routing. Passengers should check the new timetable for exact schedule.

Route X8--Change in routing. Eastbound trips (to Carver Terrace) operate from Union Station to Massachusetts Avenue and First Street NE (Union Station Plaza South), then turn right on First Street NE, left on D Street, and continue over the previous route. There has been no change in Westbound (to Union Station) routing and no change in arrival or departure times.