"How many people know that hazard lines, the long ones, have one cats eye per line and the normal centre line has one cats eye every two lines. So when you are out night driving and the headlights pick up twice as many cats eyes you know there is some potential hazard ahead. I didn't, when I first learnt to drive. Just a bit of trivia. "
That was one of the useful bits of information I picked up when I did my training for the IAM Advanced Driver test. Another was that the people charged with putting up road signs or road markings don't like to use any more paint than they have to. Therefore, if you see extra road markings, such as white lines on the nearside of a country road, or a traffic sign with a yellow background; they are there for a very good reason.
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