Kalma Chowk was closed for all traffic on Tuesday for the construction of two underpasses and Metro Bus corridor, a private TV channel reported.
The intersection would remain closed for 20 days and more than 1.5 million people would suffer because of the construction on a daily basis for the next 20 days.
The diversion plan issued by City Traffic Police and TEPA would cause congestion on Canal Road, Mall Road, Zahoor Elahi Road, Jail Road and Gulberg Main Boulevard.