What do the yellow H signs mean?
Mystery Hour QuestionAt 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?
** 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 Ė so 100mm. The lower figure is the distance from that plaque to where the hydrant is in metres.
Image from: eyeSPIVE on Flickr