Palin, who is mulling a White House run, is kicking off an East Coast bus tour.
The nonprofit Rolling Thunder will lead thousands of motorcycle from the Pentagon into D.C. Sunday. The group says it hopes to draw attention to American troops who fought in wars and are still unaccounted for.
Also on the group's schedule is a speakers program at the Korean War Memorial and a musical tribute to veterans.
The U.S. Park Police say motorists can expect multiple road closures throughout the day Sunday around the Mall and monuments. Officials say public transportation is the best way to get around the area.
The closures include Constitution Avenue, which will be shut from Pennsylvania Avenue NW to 23rd Street NW, and Independence Avenue from 1st Street SW to 23rd Street SW. Memorial Bridge and Memorial Avenue will also be closed from Route 110 to Arlington Memorial Circle. Ohio Drive will be closed from Independence Avenue to Virginia Avenue.