However, as the man who was responsible for the Selby rail crash found out, drive when you are tired and you will go to jail if you have an accident. In his case he alone was culpable because he spent the entire night before on an internet chat room. Should you be FORCED to drive after a 16 hour crew duty day then the RAF would also be culpable in the event of an RTA. I suspect it is this aspect that DCinC is driving at!