WATCH: Group shuts down a GTA highway to do stunts

A veteran police officer calls it dangerous and illegal.

OPP Sgt. Kerry Schmidt shared shocking video online that shows a group shutting down traffic on a GTA highway as drivers do stunts in front of them.

It's not clear when this video was taken but it looks like the group was in the eastbound lanes of the 409 near the 427.

We are looking for more details when this happened and whether police are investigating.