Are they the things designed to supplement those pathetic (probably ICAO) orange flashing lights in the grass beside each holding point, the ones that replaced the very effective HP flashing lights embedded in the taxiway right where you look?
You don't fly enough Bloggs, they are in the sealed shoulder...
There's 2 types of HP lights available for use in Australia, Pattern A and Pattern B. Pattern B are the inset guard lights you refer to.
