In article , k
writes
But I can well imagine that someone could play half an hour of squash
*knowing that you can stop at any time* but not spend 3 hours driving a
train *unable to stop*.

So if a driver becomes unwell he has to carry on til it is convenient
for hime to stop working?

No. But if he expects it to be not unlikely in 3 hours, he shouldn't be
driving.

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