I’ve been that broken down driver, but they asked a driver only 6hrs into shift to swap with me, just that; they asked. He was well within his right to say no chance but he bailed me out of a night out after I was already hitting 12h and 2.5h from base.
Your boss should have been clear with you from the start and asked the question. It’s not your fault the driver was on o/t and running out of hours.
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