Where the drive round runs out
You move machines on the monthly repositioning call, and what you know about the sites comes from your reps, the contracts out on hire and the trackers on the machines that have one. Plant that isn't yours doesn't show up in any of those.
A site can be winding down for weeks before an off-hire call reaches you, and another can ramp up with nobody on it from your branch. You find out on the next visit, and by then the excavator you needed moved is still sitting at the wrong depot.

