Metro will offer special bus service to and from Ronald Reagan's swearing-in and the Inaugural Parade on Tuesday.

On many routes, however, Metro buses will be running on a modified Saturday schedule on Tuesday, which means that morning and evening rush-hour service to and from many employment centers will not be operated.

Most of the special Metro buses will begin their Inaugural Day runs in outlying suburbs and terminate at subway stations where passengers will switch to trains for the trip downtown.

Regular offpeak bus fares will be charged -- a basic 60 cents plus a surcharge for crossing the District of Columbia line from Maryland or Virginia. The regular procedures for transferring between buses and trains will be in effect.

Following is the list, released by Metro, of bus routes on which extra service will be operated. Routes not shown will follow the normal Saturday procedure, either operating on a reduced schedule or not at all. Maryland and D.C. routes

30 -- Friendship Heights to Potomac Avenue subway station via Wisconsin Avenue, Georgetown and Pennsylvania Avenue, detouring around the parade route from 23rd Street and Pennsylvania Avenue via K Street, 13th Street, E Street and Union Station Plaza. Routes 32, 34 and 36 will follow the same detour.

42 -- Mount Pleasant to Stadium-Armory via F Street.

50 -- 14th Street and Colorado Avenue to Bureau of Engraving via 14th Street. During the parade, buses will terminate at 14th and G Streets NW.

82 -- Hollywood, Md., to Rhode Island Avenue subway station via Rhode Island Avenue.

84 -- New Carrollton to Rhode Island Avenue station via Eastpines and Bladensburg.

86 -- College Park to Rhode Island Avenue station via Prince George's Plaza.

D2 -- Glover Park to Metro Center subway station via Georgetown.

D4 -- Sibley Hospital to Metro Center via MacArthur Boulevard and Georgetown. (Regular Saturday schedule will be operated on the eastern end of the D2/D4 line to and from Ivy City.)

G6 -- Avondale to 11th and E Streets NW via Brookland and Rhode Island Avenue.

F2 -- Takoma to Cheverly via Chillum, Avondale and Mount Rainier.

H12 -- Temple Hills to Potomac Avenue subway station via Marlow Heights, Hillcrest Heights and Suitland.

J12 -- Andrews Air Force Base to Addison Road subway station via Marlboro Pike and Capitol Heights.

K6 -- White Oak to Fort Totten subway station via New Hampshire Avenue and Langley Park.

K12 -- Andrews Air Force Base to Potomac Avenue subway station via Pennsylvania Avenue Extended.

L4 -- Wheaton to Federal Triangle via Chevy Chase and Connecticut Avenue.

L8 -- Aspen Hill to Federal Triangle via Chevy Chase and Connecticut Avenue. (When Pennsylvania Avenue is blocked because of the parade, all route L buses will terminate downtown at 16th and E Streets NW.)

M11 -- Andrews Air Force Base to Potomac Avenue subway station via Suitland Road.

N2 -- Friendship Heights to Farragut Square via Spring Valley, Wesley Heights and Massachusetts Avenue.

N4 -- Glen Echo to Farragut Square via Massachusetts Avenue.

R2 -- Calverton to Brookland subway station via Beltsville, University of Maryland and Prince George's Plaza.

T2 -- Rockville (Montgomery College terminal) to Dupont Circle subway station via Potomac and River Road; express within D.C.

T6 -- Rockville (Montgomery College terminal) to Dupont Circle via Rockville Pike and Wisconsin Avenue; express within D.C.

Y8 -- Olney to Silver Spring subway station via Georgia Avenue and Wheaton Plaza. Virginia routes

All but two of the Virginia bus routes on which extra service will be operated will terminate at subway stations within Virginia. The two routes that will run downtown are:

9B -- Fort Belvoir to a special terminal on Constitution Avenue near 10th Street via U.S. Rte. 1 and Washington Street/Alexandria.

38A -- Ballston subway station to Farragut Square via Wilson Boulevard, Rosslyn, M Street and K Street.

Bus routes operating to subway stations are:

1A -- Heritage Mall, Annandale, to Ballston via Annandale Road and Wilson Boulevard.

1F -- Fairfax Circle to Ballston via Arlington and Wilson Boulevards.

1M -- Annandale to Ballston via Annandale Road and Wilson Boulevard.

2C -- Tysons Corner to Ballston via Lee Highway and Washington Boulevard.

2M -- Merrifield to Ballston via Lee Highway and Washington Boulevard.

3B -- Tysons Corner to Rosslyn via Leesburg Pike and Lee Highway.

3C -- Seven Corners to Rosslyn via Sycamore Street and Lee Highway.

4A -- Culmore to Rosslyn via Arlington Boulevard.

5S -- Herndon to Rosslyn via Leesburg Pike and Chain Bridge Road.

6A -- Landmark to Pentagon via South Fairlington and Parkfairfax.

6B -- Downtown Alexandria to Pentagon via South Fairlington and Parkfairfax.

7A -- Landmark to Pentagon via Beauregard Street and North Fairlington.

11D -- Springfield to National Airport via Franconia Road and Washington Street/Alexandria.

11W -- Fairfield to National Airport via Fort Hunt Road and Washington Street/Alexandria.

12A -- Downtown Alexandria to Pentagon via Cameron Mill Road.

14A -- Downtown Alexandria to Pentagon via Mount Vernon Avenue.

15A -- Downtown Alexandria to Pentagon via Russell Road.

16E -- Annandale to Pentagon via Columbia Pike.

17A -- Kings Park West to Pentagon via Braddock Road, Little River Turnpike and Shirley Highway.

18A -- West Springfield to Pentagon via Old Keene Mill Road, Backlick Road, Edsall Road and Shirley Highway.

21C -- South 36th Street and Quaker Lane (Fairlington) to Pentagon via Duke Street and Shirley Highway.

27H -- Hayfield to Pentagon via Telegraph Road, Franconia Road and Shirley Highway.

28G -- Skyline Center to Pentagon via Seminary Road, southern Towers and Shirley Highway.

29E -- Annandale to Pentagon via Little River Turnpike and Shirley Highway.

29L -- Fairfax City to Pentagon via Little River Turnpike, Capital Beltway and Shirley Highway.

In addition to the above, Metro will operate a free shuttle between the Pentagon north parking lot and Arlington Cemetery subway station.