Also, think about it, when landing or taking off we also cross the same airspace as the undershoot, just a few meters further, but we don't get clearances like "Clear take off/to land AND clear to cross the damn undershoot!
Oh how we argued the same thing! Apparently at EDI the A15/17 RUNWAY AHEAD markings are in the wrong place anyway - they are for the C1 entry to 06/24, not 12/30 - these add to the confusion for a taxi clearance all the way to D1. There are supposedly new taxiway centreline markings coming into force (already in use at Prestwick I believe) which will lead to further questions if they are used leading up to A15/17 either side of 12/30 - even if the RUNWAY AHEAD markings are removed. We (ATCOs) have also argued that when we need an aircraft to hold short of 12/30 when it is being used, most of us state "landing / departing traffic on 30", so shouldn't this become the norm, rather than a crossing clearance - which sometimes the local pilots read back even when they've not been given it! Believe me, we don't say it for fun, enjoyment, or just to get you to read back even more, and we are campaigning to have it removed, or the conditions for when it is said altered, but for now NATS apparently wish all aiports with a runway crossing to explicity state a crossing clearance in the taxi instructions. Sorry
