This roundabout also has a security camera which records vehicle movement in and out of the area.
The Crossing was designed to handle up to 135,000 vehicle movements each day.
But, it is not uncommon for more than 170,000 vehicle movements to take place in one day.
The final cost of the project was £120 million and it was designed to accommodate about 20,000 vehicle movements per day.
So, they will also have found that the airport security police we passed at the checkpoint record all vehicle movements in and out.
Also, unexpected vehicle movements such as lane changes may occur with little warning.
The usable space of the road for vehicle movement has thereby considerably increased.
Although vehicle movements are often more effective when undertaken in groups of 30 or more.
He had four days' worth, ninety-six hours, nearly three thousand separate vehicle movements.
Quite a time passed before the pattern of vehicle movement released him.