Traffic was thrown out of gear in and around Sealdah on Friday, the only working day in the four-day period when the flyover will remain shut to facilitate its safety audit and load test.
An engineer of the Calcutta Metropolitan Development Authority (CMDA) that maintains the structure said that it would be closed to traffic till 6pm on August 18.
The closure started on Thursday evening when most offices and schools remained shut because of Independence Day.
Hundreds of commuters, students and office-goers had to brave a stop-and-go ride to their destinations on Friday even as the police diverted traffic through several arterial roads and feeder roads around the flyover.
