The Stevenson Expressway wraps around the McCormick Place Convention Center as it makes its merge into Lake Shore Drive.
Rail lines that run beneath McCormick Place will remain in service during next month's NATO summit, the Secret Service announced Tuesday.
Commuters, however, should plan for some snags and delays because of the heightened security that comes with an event that welcomes international leaders.
"Our plan presents the best possible solution to balancing the need for comprehensive security while minimizing delay and intrusion on ridership," Frank Benedetto, special agent in charge of the Secret Service’s Chicago field office, said in a statement.
Trains operated by Amtrak, the South Shore Railroad and the Metra Electric lines pass underneath the West building every day.
The summit in Chicago will be held May 20 and 21.