Construction of the aerial bridges that will carry tracks for the Dulles Corridor Metrorail Project over I-495 at Route 123 will begin Sunday night and continue through Friday, May 20.
Crews will be using a large horizontal crane to build the bridges over I-495.
Two lanes of northbound I-495 will be closed overnights from 11 p.m. to 5 a.m. Monday through Thursday and from 10:30 p.m. Friday night to 7 a.m. Saturday morning.
Drivers should expect significant delays each night.
