You have to block the road using cars and wait for the enemy to arrive.
First go to Sector 1 Bivouac
Drive the car from the Wild Mystery to the West of the Bivouac
Drive to the road which is parallel to coast on the East
Park the car sideways halfway across the road (one set of tires on the tire tracks)
Do the same using the other car found here to block the road.
Now just find a good cover spot and wait.
When two enemy cars arrive, activate the technique and start shooting.
Sie müssen die Straße mit Autos blockieren