A concrete median on Highway 401 in southern Ontario has been credited with saving a roadside worker from injury or possible death after a wheel flew through the air after becoming dislodged from a truck.

Two wheels flew off a westbound tractor-trailer on Friday afternoon near Veterans Memorial Parkway in London, Ont.

One tire bounced off into a field. But the other tire landed near the centre median "narrowly missing another worker on the highway," said OPP Sgt. Dave Rektor in a post on Twitter.

"The tire would have probably taken out one of our road workers today. Fortunately the wall stopped the tire," he said, broadcasting live on Twitter via the Periscope app.

You can view Sgt. Rektor's video post below or by going here.

LIVE on <a href="https://twitter.com/hashtag/Periscope?src=hash">#Periscope</a>: Another tire off - lucky no injuries! SGT REKTOR WR OPP <a href="https://t.co/I6DTqf6AlC">https://t.co/I6DTqf6AlC</a> —@OPP_WR

Police and Ontario's Ministry of Transportation are investigating.

"This is just so dangerous. They can kill. If that hits a car at highway speeds, somebody's going to die" Rektor said while inspecting the truck and looking over the tire investigators picked up.

"It's becoming an all-too-familiar scene on our highways."

In January, a 69-year-old Burlington, Ont., man died in hospital, hours after his vehicle was crushed by a wheel that flew off of a transport truck on Highway 400 near King Road.

In September 2015, a Brampton, Ont., woman died after she was hit by a flying wheel that dislodged from a dump truck in nearby Mississauga.