[This post has been updated to reflect that closures will now begin Tuesday night.]
Crews plan to close three right lanes of northbound I-495 beginning Tuesday from 11 p.m. to 5 a.m. Closures, which are due to the construction of an overhead bridge that will carry Metro trains, are also scheduled for Wednesday, Thursday and Friday.
The closure of two right lanes on southbound 495 at Route 123 is scheduled for Sunday from 10 p.m. to 5 a.m.
Project officials warn that drivers should expect delays in the area during the closures.
All ramps to route 123 will be open, and police will be on site, officials said.