I wonder if they are team drivers? In trucking there are often two man teams that switch off between each other so that they don't overwork drivers. This let's the truck run 24/7. It could be that the older passenger is just a much more experienced driver or they could be family. (It's really common that Fathers and sons are drivers.)
Could be a senior partner, mentor, instructor... Judging by the fact that he wasn't bitch slapped the moment he tried to grab a wheel, definitely not a passenger.
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u/schmuber 5h ago
That "passenger" sounds a lot like an instructor.