Originally Posted by
rickair7777
This is a non-issue when things go according to plan. But if the crew screws up the taxi route, they could end up crossing an in-use runway on the assumption that they have an implied crossing restriction.
I don't recall if this on was in the quiz that I mentioned but this is the type of scenario I was talking about
http://204.108.4.16/d-tpp/0910/00015AD.PDF
You are at the cargo area at the southwest corner of the airport. You are given instructions to "taxi to runway 31 via Alpha and Bravo." A good number of pilots looking at the scenario answer that they can cross 13/31 without additional clearance.