The Rotherhithe Tunnel has re-opened within the last half an hour, TfL has told the News.
The tunnel was closed yesterday morning while engineers investigated flaws with the crossing’s fire alarm systems.
The closure caused traffic chaos last night, with large amounts of traffic on Jamaica Road, Tower Bridge, Lower Road and others.
Drivers were left waiting in long queues as a result, with the problem further compounded by a broken down vehicle on Tower Bridge.