CT's cannot go into the tunnel leading T spawn from the tanker area.
CT's cannot enter the sewers.
CT's cannot exit the compound via the back door next to the toilets.
All these rules are off when the bomb has been planted.
There....that was easier than I thought..... :wink:
(http://www.btinternet.com/~p.d.herbert/mhpcs/2dmaps/roadhouse.jpg)