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Double manning rules don’t apply but you can take your break on the drive back. A break is simply a period when you do no driving, no other work and use it for recuperation and sitting in the rocking chair doing nothing would meet those requirements. You may jut have to take a printout to explain you were on break and not POA but couldn’t record it with the card in slot 2.
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Better to put your card in slot 2 because you will probably have a bit of other work before you finish your shift.
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