The first of three public hearings on proposed cutbacks and other changes in Metrobus service on more than 50 Northern Virginia bus routes will be held tonight at 7:30 at Lee High School, 6540 Franconia Rd., Springfield.

Metro officials said the proposals, which they said would eliminate underutilized or duplicative bus service, would save more than $1 million a year.

The recommended cutbacks, which follow similar proposals by Fairfax County and other Northern Virginia officials, are in line with Metro General Manager Carmen E. Turner's plan to curtail service on bus routes with relatively low ridership. The proposals are expected to draw protests by bus riders.

One planned cutback already attracting opposition is a proposal to eliminate nonrush-hour service on the 17B and 17C bus between the Pentagon and Old Forge. Morton Von Duke of Springfield said the recommendation is "a perfect example of arrogance on the part of the bus company. They have given no thought to anybody not in 9-to-5 work hours."

Von Duke said the 7:20 p.m. bus from the Pentagon, which he frequently rides, is "usually quite full . . . . I'm going to have to walk more than a mile home if they eliminate that bus."

Metro officials said other hearings will be held March 4 at 7:30 p.m., County Board Room of the Arlington County Courthouse, 1400 N. Courthouse Rd., Arlington, and March 5 at 7:30 p.m., at George Mason Junior/Senior High School, 7124 Leesburg Pike, Falls Church.

Final decisions made by the Metro board on bus changes are scheduled to take effect in June, Metro officials said. PROPOSED CHANGES: ROUTE 1 (Wilson Boulevard Line) 1A -- Midday and evening service to be rerouted via Hillwood Avenue and Annandale Road. 1B -- Midday and evening service to be eliminated. 1D -- Route to be eliminated. 1E -- Rush-hour service to be increased but late trips to be eliminated. 1F -- One late evening trip to be eliminated. 1H -- A new designation for Route 1A trips operating via Hillwood Avenue and Annandale Road. 1M -- All trips to be rerouted via Hillwood Avenue and Annandale Road. ROUTE 2 Washington Boulevard Line) 2A -- Late evening service to be reduced. ROUTE 3 (Lee Highway Line) 3A -- Route to be eliminated. 3E -- Late evening service to be eliminated ROUTE 5 (Chain Bridge Road Line) 5K -- Rush-hour service to be increased; some Farragut Square trips to be terminated at Rosslyn. 5W -- Route to be eliminated. ROUTE 5Y (Herndon Express) 5Y -- To be rerouted in Herndon. ROUTE 6 (Bradlee -- South Fairlington Line) 6A -- Route to be eliminated in ParkFairfax. 6G -- Additional trips to be operated. 6L -- Route to be eliminated. 6P -- Route to be renumbered 7P. ROUTE 7 (Lincolnia-North Fairlington Line) 7C -- A new rush-hour route to operate between Park Center, Claremont and the Pentagon. 7D -- Route to be eliminated. 7E -- Rush-hour service to be increased. 7H -- A new rush-hour route to operate between the Pentagon and Eisenhower Avenue. 7P -- A new designation for trips on Route 6P between the Penatagon and Park Center. ROUTE 8 (Foxchase -- Seminary Valley Line) 8W -- To be rerouted via Howard Street and Taney Avenue. 8X -- Service to be reduced. 8Z -- Service to be increased. ROUTE 10 (Alexandria -- Arlington-Pentagon Line) 10B -- Rush-hour trips to be extended to East Falls Church. 10C -- A new route to be operated between Hunting Towers and East Falls Church via Arlington Hospital. ROUTE 13 (National Airport -- Pentagon -- Washington Shuttle) 13A -- New service to operate in morning rush-hour. 13B -- New service to operate in evening rush-hour. 13C -- All service to be eliminated during morning rush-hour. 13D -- All service to be eliminated during evening rush-hour. ROUTE 17 (Kings Park Line) 17A -- Trips to be added and route to be revised in Kings Park West. 17B -- Route to be eliminated. 17C -- Route to be eliminated. 17K -- Route to be extended to Queensberry Avenue and Leesville Boulevard. ROUTE 18 (Springfield -- Orange Hunt Line) 18A -- To be rerouted in West Springfield, Springfield Mall and Bren Mar and additional service to be operated. 18B -- Route to be eliminated. 18C -- Route to be eliminated. 18D -- Last evening trip from the Pentagon to be eliminated. 18E -- To be rerouted via Amherst Avenue and Commerce Street. 18G -- To be rerouted in West Springfield via Hillside Road, Huntsman Boulevard, Blarney Stone Drive and Fieldmaster Drive. 18H -- Route to be extended to Newington Forest via Huntsman Boulevard, Pohick Road and Newington Forest Avenue. 18K -- To be rerouted in West Springfield via Greeley Boulevard and extended via Cottontail Court, Game Lord Drive and Reservation Drive. 18M -- Route to be eliminated. 18R -- Route to be extended via Coffer Woods Road. ROUTE 22 (Walker Chapel-Shirlington Line) 22A -- Route to be eliminated. 22B -- Route to be extended to 36th Street and Williamsburg Boulevard. 22G -- Route to be eliminated. ROUTE 23 (Glebe Road Line) 23A -- To be rerouted in Crystal City. 23T -- To be rerouted in Crystal City. ROUTE 24 (Tysons Corner -- Pentagon Line) 24A -- Midday and evening service in Fairfax County to be eliminated. 24F -- Route to be eliminated. ROUTE 26 (Tysons Corner -- Springfield Mall Line) 26A -- Frequency of midday service to be changed from 60 minutes to 120 minutes. ROUTE 29 (Annandale Line) 29C -- Evening rush-hour service to be operated. 29E -- Northbound service during evening rush-hour to be eliminated. ROUTE 29M (Alexandria -- Fairfax Line) 29M -- Late evening trips to be eliminated.