'hows my driving? call 0800 ***********'. If you phoned the number you wouldn't get the man in the van, you'd get an answerphone in the office where you could leave a message commenting on the driving, and giving time and date of something the driver has done that deserves comment.

In fact it is not a silly sign, it's a way of giving drivers a warning that if they cut up other road users and put the firm's vehicles at risk, there may be nasty consequences for them later.