Horn is not OK, please!
The back of a truck is often a fascinating sight beneath the customary grime of the road, a plethora of slogans can be seen, many of them entertaining. The most common, of course, is “Horn OK Please” which can be seen on trucks, tempos, trailers and other multi-axles though no one quite knows how and when it came about, and what it is supposed to mean.

It encourages unnecessary honking, says the government