So what would you do if you were waiting to cross at the midpoint; one aircraft had just touched down but was yet to pass you, there was another 2.5nm out on approach, and I'd just given you an 'after the landing, cross......' clearance. Would you know I meant after the at 2.5nm, beacuse that's what MATS Part 1 says? Would I be safe to assume all pilots are as familiar with that document?
I would look out my window and see that you had provided an unsafe clearance.
You could have no traffic on the runway and say "after the landing A320 cross 27L" and as said A320 vacates at the exit prior to me wonder what you were talking about.
Perhaps you need to have a think about conditional clearances issued to traffic waiting to cross at the midpoint etc.
PaulW, so true!! but isn't that why we make our initial call to approach with type, atis code and qnh?