Toronto police say they're investigating video footage of three people skateboarding down a portion of the normally jam-packed Gardiner Expressway in downtown Toronto.

In the clip, we see three people on skateboards (or potentially longboards) expertly navigate their way down what appears to be the York-Bay-Yonge off-ramp.

The athletes perform a few jumps, slides and other tricks that I don't know the names of but that look really cool as they head west down the ramp.  The video cuts off as they reach the bottom of the incline and round a corner north.

It is not known for sure who originally posted the video, but it has been widely attributed to the Instagram account of a local skateboarder named Morgan Smith.

The video does not appear on Smith's profile as of Wednesday morning, but several other social media users credited his account when re-posting the video on Monday, suggesting that it may have been uploaded as an expiring Story.

Toronto Police say they're investigating this video of three people skateboarding on the Gardiner Expressway - 📹 Morgan Smith https://t.co/42rah4NVTd #Toronto #Skateboarding pic.twitter.com/jUzMDbk1mr

— blogTO (@blogTO) May 6, 2020

Whatever the case, a version of the clip posted to TikTok by an account called @6ixdripTV is receiving quite a bit of attention today — from both fans of the stunt and cops.

"Skateboards are treated as toys so anybody on a skateboard is treated as a pedestrian," Toronto Police Service Const. David Hopkinson said to CP24 of the footage on Tuesday night.

"There are no pedestrians or people allowed on the highways, the 400 series highways, at all. It is completely against the law."

Hopkinson said that, if caught, skateboarders could face a fine of about $110 — and that's only if they're lucky enough not to be hit by any vehicles.

"We are talking about skateboarders wearing black on an all-black asphalt highway. Difficult to see," he said to CP24. "If they were to stumble, hit a rock [or] fall, cars might have difficulty stopping before they struck them. That is why we don't allow pedestrians on the highways."