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Tuesday 1st December 2015
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What do the yellow H signs mean?

Mystery Hour Question

fire hydrant signAt the side of the road, there are yellow signs with an H on with two numbers on, marking out a fire hydrant. What do those numbers mean?
Glenn, Romford


** Definitive **
Name: Jim, Hammersmith
Qualification: Hydrant Master
Answer: The figure at the top is the size of the main that feeds that hydrant in millimetres so 100mm. The lower figure is the distance from that plaque to where the hydrant is in metres.

Image from: eyeSPIVE on Flickr

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