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.

The Garda National Drugs and Organised Crime Bureau (GNDOCB) arrested Sean Mackey, 53, and two other men during an operation on February 22nd.

Motorists have been advised to avoid the area near Blanchardstown.