City crews will be examining sections of the Gardiner Expressway after a 4.5-kilogram chunk of concrete fell onto Lake Shore Blvd. W. on Monday, hitting a guardrail and ricocheting into the road.

Aside from the dangers inherent in a chunk of concrete weighing almost as much as a bowling ball falling from the sky, the expressway itself is sound. This is according to Professor R. Doug Hooton (CivE), who provides expert comment.

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