All three levels of government must work together to fix the Gardiner Expressway before somebody gets hurt, says the NDP's transport and infrastructure critic.

Olivia Chow made the comments just one day after a chunk of concrete fell onto Parkside Drive from under the expressway.

"Torontonians shouldn't have to wear a helmet to come under the Gardiner Expressway," Chow told reporters. "Enough buck passing. Let's come together and fix the Gardiner (Expressway) for good."

Over the last week, concrete has twice fallen onto a road below from the elevated section of the Gardiner Expressway.

Though nobody was injured in either incident, the falling concrete narrowly missed a passing vehicle Thursday.

Last June, a similar incident featuring a basketball-sized chunk of concrete also made headlines, kicking off a firestorm of debate on whether the 60-year-old highway posed a safety threat.

"There needs to be zero tolerance for raining concrete under the Gardiner (Expressway), and zero tolerance for this type of crumbling infrastructure across Canada," Chow said. "We shouldn't have to wait till someone is seriously injured or dies to take action."

On Friday, Chow brought along several photos showing crumbling and cracked concrete underneath different parts of the Gardiner Expressway.

She said with a $123 billion infrastructure debt across Canada, the federal government needs to invest more money in keeping roads, bridges and overpasses in acceptable condition.

"The city just does not have enough funds and that's why the federal government must step up to the plate," she said of the city-controlled Gardiner Expressway.

On Thursday John Bryson, manager of structures and expressways for the City of Toronto, told reporters that the Gardiner Expressway is structurally sound and described falling concrete as a problem that is bound to happen from time to time.

He said the concrete that has fallen over the last week has been "cover concrete," simply meant to protect "structural concrete" from the elements.

Despite Bryson's assurances, NDP MPP Jonah Schein told reporters Friday that something needs to be done to find a long-term solution.

"Obviously we have a real safety issue," he said. "We have to put people's safety first in this city."