hmm... how should this be described...? Oh well, here goes:
There is only one general 'area' that the T's HAVE to use to leave spawn - I will choose to call it 'the Strip'.
The Strip is the area where from the T's perspective, you have an upper balcony route overlooking the two tunnel exits from the Strip to (a) the stairs up (from far end of the strip); and (B) the stairs up or passageway through to bombsite (right turn off the strip).
On the balcony level, CT's should not go further than the passageway intersection overlooking the strip and above the stairway-only exit from the strip (a).
CT's cannot go down the stairway to the exit from the Strip (a).
CT's cannot enter the 'archway' (B) leading to the Strip.
T's cannot go through CT spawn.
All of the above rules are off once the bomb has been planted.
(http://www.btinternet.com/~p.d.herbert/mhpcs/2dmaps/egypt.jpg)