Pieces of concrete fell off the Gardiner Expressway onto Bathurst Street before rush hour early Wednesday, resulting in Bathurst being closed between Lake Shore Boulevard and Fort York Boulevard.
There were no immediate reports of injury or damage.
As a result, however, there were no 511 Bathurst streetcars operating between Queen Street and Exhibition Loop.
John Bryson, city engineer and manager of structures and expressways, said Wednesday the extremely hot weather might be partly to blame for falling concrete.
This isn't the first time the elevated expressway has had reports of falling concrete.
On June 25 pieces fell onto a car while a man was driving to work. The driver wasn't injured, but after the incident, Toronto staff briefed a council committee on the state of the Gardiner, which they said is in need of significant rehabilitation in the next 10 years.
There have been at least five instances in just over two month of concrete falling from the underside of the Gardiner Expressway and onto the roadway below. The map below depicts at least four other documented instances in the last few years.