The Tollygunge- Karunamoyee bridge was closed to traffic on Monday for conducting a load test.

The bridge will remain closed till 6am on Thursday, police and Calcutta Metropolitan Development Authority (CMDA) officials said.

Making most of the empty roads and thin traffic during the lockdown, the CMDA has decided to conduct load tests of several elevated corridors in the city, which have been pending for long.

The load tests are being conducted as part of an overall health audit of the structures.

Chetla bridge, which connects the Rashbehari crossing and Chetla, will remain closed to traffic for three days from Friday, a CMDA official said.

Chitpore bridge that runs between BT Road and Bagbazar will be shut down soon to assess the condition of the bridge’s pavement. The bridge has been retrofitted to extend its life by another five years, said a CMDA official.

“We are trying to conduct load tests of as many bridges and flyovers as possible during the lockdown since the traffic load is low. Even if the lockdown is lifted after May 17, all sectors are unlikely to be opened at one go. So traffic will still remain less. We will try and carry on with load tests of the remaining structures even then,” a CMDA official said.

The state urban development department started a health study of several elevated corridors in the city after the collapse of the Majerhat bridge in September 2018.

The completion of the Majerhat bridge is, however, set to be delayed. “We had targeted an early September completion, but that target will be missed. We could begin our work only after April 20 when the government gave special permission to continue the project. But getting workers and materials is proving to be difficult,” said the PWD official.

The demolition of Tallah bridge has continued through the lockdown.