Last night I almost parked my rig on top of some muppet.
Picture the scene: small car (focus, I would say) towing a people carrier on an "A" frame. Nothing wrong so far, let's go for the rest of the scenario: 0300, thick fog, and, best of all, no lights on the friggin' towed vehicle.
The complete idiot was doing about 25mph on the M1. By the time I could see the lights on the small car past the "trailer", I was almost on top of him. At least, I know that the ABS on my unit and on the trailer I was pulling works a treat.