The District of Columbia government is planning to inaugurate this summer special weekend and holiday bus service that will cater to family groups and tourists visiting the city's monuments, museums and other cultural attractions.

The service, tentatively approved by the Metro board's budget committee yesterday, will operate on two special bus loops -- one through Northwest Washington, the other through Southeast. Both loops will connect with the Metro subway system.

The proposed fares would be $1 per person and $2.50 for a family of four, with unlimited boardings each day and free transfers between the two bus loops.

The routes will serve most tourist atractions in the District, including the National Zoo, the Kennedy Center, the White House, the Capitol, the Washington Monument, the Smithsonian museums, various art galleries, the Library of Congress, Union Station, the Navy Yard, the Frederick Douglass home and the Anacostia Neighborhood Museum.

Buses would run every 20 minutes between 10 a.m. and 6 p.m. on Saturdays, Sundays and holidays from May 24 until Sept. 7. The cost of the service is estimated at $80,811. The city expects to receive $39,000 in fares, and pay a subsidy of $41,811.

District of Columbia City Administrator Elijah B. Rogers said the city could afford to pay for the service, providing the subsidy does not exceed $61,355. Metro buses will be used on the routes.