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WATCH: Startling moment truck slams into freeway overpass

Incredible video has emerged showing a truck slamming into the Hay Street overpass on Mitchell Freeway.

The dashcam video shows the force of the impact and the frightening aftermath for drivers following behind.

Keep your eyes on the big truck in the above video footage.

The truck smashes into the overpass with a car close behind. Source: 7 News
The truck smashes into the overpass with a car close behind. Source: 7 News

It happened on Tuesday morning on the Mitchell Freeway in West Perth.

A truck carrying heavy machinery slammed into the Hay Street overpass.

Liam Croy was driving the grey car directly behind the truck.

Liam Croy was in the car directly behind the truck. Source: 7 News
Liam Croy was in the car directly behind the truck. Source: 7 News

"A split second before the truck reached the bridge I thought 'he's in trouble, he's not going to clear that*, Liam said.

Liam believes the truck was travelling at least 80 kms per hour when it hit the overpass.

Liam believes the truck was driving at around 80 kms per hour when it hit the overpass. Source: 7 News
Liam believes the truck was driving at around 80 kms per hour when it hit the overpass. Source: 7 News

His car and several others were damaged when chunks of concrete and debris rained down on them.

"Two dents here really, so I got away pretty lucky," Liam said.

The truck driver is believed to be from Victoria. Source: 7 News
The truck driver is believed to be from Victoria. Source: 7 News

"I'm glad that the truck squeezed under the bridge and didn't just stop dead still because I might of went straight into the back of the truck."

There was some cleaning up to do after the accident. Source: 7 News
There was some cleaning up to do after the accident. Source: 7 News

Main Roads says the overpass is structurally sound and it will ask the truck driver, who is believed to be from Victoria, to pay for the clean up and repairs.