The point is, surely, that "everyone" speeds and if you are like me (nicknamed Captain Slow by the lads at work) and keep to the limits you are, like PeteXXX said, tailgated in an attempt to intimidate me into driving faster.
I was once at a Xmas social where several of those present had recently been caught speeding (thanks to a recent and very rare, purge). All were complaining how unfair it was, one lady was incensed that her husband, "a very good driver," had been caught doing 45mph, they all agreed with her, until someone else pointed out that he had been in a 30mph limit!
I was once at a Xmas social where several of those present had recently been caught speeding (thanks to a recent and very rare, purge). All were complaining how unfair it was, one lady was incensed that her husband, "a very good driver," had been caught doing 45mph, they all agreed with her, until someone else pointed out that he had been in a 30mph limit!