You can add location information to your Tweets, such as your city or precise location, from the web and via third-party applications. You always have the option to delete your Tweet location history. Learn more
Have you ever wondered what these little "H", "HP", "HR" and "SV" signs, nailed or adhered to NSW telegraph poles or streetsign poles, mean? If so, read on...pic.twitter.com/BHyJB7q9Jy
All of the signs with a "H" are markers for the location of a subsurface fire hydrant. The "P" indicates that the hydrant is under the "pathway" and the "R" indicates that it's under the "road". The green colour indicates that the hydrant is on the opposite side of the road.
Sometimes there are numbers between the letters. The top number is the distance (in metres) from the marker to the hydrant. The bottom number is the size (in millimetres) of the water main. The markers also generally face in the direction to the hydrant.pic.twitter.com/5HqtEzLvnN
So once you see the marker, you should be able to find the location of the hydrant. It's under a cast iron cover, on the road or footpath. Finding them can be a fun walking-to-school game 
. Sometimes they're painted yellow to make it easier.pic.twitter.com/nFV8bJJfXp
Increasingly, you'll also see these little blue reflective markers on the road. They also indicate the location of an adjacent fire hydrant. They can be easier for fire services to find in the night.pic.twitter.com/mCoxfJfSUE
Finally, "SV" stands for "sluice valve", which is an on-off tap fitted to a water pipe. The water utility can use it to isolate sections of the water supply for maintenance or to shut of major leaks. Again the numbers indicate the distance (9m) and size of the water main (100mm).pic.twitter.com/hAICScxa7P
Actually, I described the green ones a bit wrong. The green ones basically mean “you’re getting warmer, but you’re not quite there”. Keep looking for a red one (hint: try the other side of the pole!).
To use the hydrants, the fire services need to attach a ‘hydrant riser’ and connected their hoses to it. Community members should ensure that they’re never obscured and never park a car over a hydrant.pic.twitter.com/09RXQEDoKv
Examples of badly placed fire hydrants. Both cars are legally parked, but the hydrants are inaccessible without the aid of a tow-truck.pic.twitter.com/BXeXJpzzgI
After reading this thread, I’m sure you can recognise what problem has been identified here.pic.twitter.com/ipkMrrXXmk
Twitter may be over capacity or experiencing a momentary hiccup. Try again or visit Twitter Status for more information.
