Traffic is backing up on the North Perimeter Highway Thursday morning due to a collision.

The collision occurred shortly after 11 a.m. according to witnesses. A vehicle can be seen flipped on its roof in the left-hand lane

The crash is affecting the westbound lanes of the highway just east of Highway 6.

It's not clear at this time how many vehicles were involved or if there are any injuries.

Emergency crews are on the scene and motorists are reminded to use caution.