Sections of the Baltimore-Washington Parkway will be reduced to one lane until Friday afternoon as workers repaint traffic lines on concrete bridge decks.
Motorist should expect lane closures from 9:30 a.m. to 2 p.m. between Route 410 in Riverdale to Route 32 in Odenton, starting on the northbound lanes.
The closures only will occur near bridges, said a National Park Service spokesman. Some traffic delays are expected.
After the northbound lane lines are completed, the southbound lines will begin.