I often fuel up after shift, which is often on the later side of midnight. I carry appendix and have had situations of cars pulling into the empty lot after me and the circling around slowly. I just skip my thumb up to my belt loop to keep hand close and keep watch. I don't know if it's the "sizing up" of they just realize their target is paying attention and they won't catch you sleeping. Either way, keep the head on a swivel
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