The cameras on the N5 are located between Lislackagh and Cuilmore in Swinford. On the N3, they have been installed between Kilduff and Billis in Co Cavan.

Average speed cameras work by monitoring a vehicle's speed over the distance of the safety camera zone

The cameras work by monitoring a vehicle's speed over a certain distance, rather than at a single point.

A fine and penalty points were issued

The crash happened on the N5 at Deerpark near Swinford.

One youth is understood to be in a critical condition

The project will see a new 34km single carriageway road built between Ballaghaderreen and Scramoge