Painted squares in road

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Mon 25 Jun 2018 18:16
Painted squares in road - hillman

I have often wondered what the 18 inch white painted squares in the road signify. Where they appear there are usually two. Do any of the BRs know ?

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Mon 25 Jun 2018 18:34
Painted squares in road - bathtub tom

bfy.tw/IlEK

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Mon 25 Jun 2018 18:34
Painted squares in road - galileo

I have often wondered what the 18 inch white painted squares in the road signify. Where they appear there are usually two. Do any of the BRs know ?

Explanation given some years back, as per this link to the forum.

www.honestjohn.co.uk/forum/post/index.htm?t=36767

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Mon 25 Jun 2018 18:38
Painted squares in road - nick62

AFAIK, they are to indicate a "known (and accurate) distance" so either a police helicopter or spotter plane (or following car) can measure your average speed.

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Wed 27 Jun 2018 11:41
Painted squares in road - colinh

Nothing to do with the police. They are used by Highways' Agency road surface surveys' vans as reference points for data logging. By using the same start points they can compare changes in the road surface that have occurred over a period

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