Where is he going?

Arrived at work to be greeted by the sight of this Navvie reversing back out of the visitors car park and nearly getting it's jib stuck in the trees.

Once reveresed he then proceeded to enter the secure car park and then tried to navigate his way around the back of the offices. Except the tracks were nearly too wide for the road, and he didn't notice the overhead wires which he nearly brought down. Here we see the driver trying to lower his job enough to get under the wires.

I wonder what is going to be done at the offices?