I have this vision of all these truck drivers parked at the edge of town, busy shining up their trucks.

I have no idea why, but they do sr. Out they get with their banister brushes getting all the dust off the wheel rims and off they go. Nullagine has 200km of dirt roads either side, but only one side has the sign. Go figure?

is the dust loaded with something deadly....lead, anthrax...footand mouth?....this really is a strange sign..

'drop dust' sounds like a euphemism to me...