These were eventually discontinued, most likely because they were a hazard in traffic. The driver could not see automobiles on the far side of the lorry, and there was the ever-present risk of the machine trundling off on its own, with the crew hurrying along to catch up and stop it.

But I imagine it must have been quite a sight in its heyday, looking to passing motorists as if it went along magically without a driver in the cab, as the dustmen went about their business at the rear.