Over the past few months I have noticed that some of the runways with a number below 10 are being labelled as “1” rather than “01” (numbers are not specific, just an example). I have also noticed that the physical runway numbers that we see on the runway are all allocated a single digit (if it’s below 10). I thought the rule of thumb was that runways are all 2 digit. Has something changed or is this an error?
See the red numbers on the GPS approach.