No, not a warning about the length of waiting time and the work ethic of loading staff! (I hope). It’s to say turn off engine and not disturb the neighbours.
Errrrr…Fascinating… 
switchlogic:
Errrrr…Fascinating…
Not a report on cutting edge technology, or updates from TNUK CSI squads tis true.
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Transport Alain Postic have those signs up in its St Gonnery depot, not for the neighbours, but because they have bunk rooms under the offices for their trunk drivers to use while taking their daily rest periods.
Looks like the bloke is waiting under the sheets for his girlfriend to climb aboard 
Franglais:
switchlogic:
Errrrr…Fascinating…Not a report on cutting edge technology, or updates from TNUK CSI squads tis true.
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I’m sure were he minded to Carryfast could turn this into a ridiculously complex nuanced work of contrarism. No, wait, I mean mind-numbing snoozefest
Just watch he doesn’t shoot Bertie! ^^^^^^^
bald bloke:
Looks like the bloke is waiting under the sheets for his girlfriend to climb aboard
He’s snoring, so he’s probably waiting for my girlfriend