One lane of the Squirrel Hill Tunnel closed in both directions until 5:30 a.m. Thursday

Drivers on the Parkway East could face traffic delays overnight Wednesday as the Squirrel Hill Tunnel closes one lane in both directions.

PennDOT announced that the tunnel will be reduced to a single lane for Interstate 376 inbound and outbound drivers “as needed” from 7 p.m. Wednesday until 5:30 a.m. Thursday.

The lanes are being restricted so crews can do scheduled maintenance on the tunnel control system, PennDOT spokesman Steve Cowan said.

During the work, officials said that lighting in the tunnel also may be dimmed.

“Motorists should use caution while traveling through the tunnel,” Cowan said.

For updates on road conditions and live 24/7 traffic cameras, go to 511PA.com. Information and alerts also are available by calling 5-1-1 or downloading the 511PA app for iPhone and Android devices.