Do a pre/post gear check before rolling. Don't be this guy.
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Well, probably this thread would be the right place to post this...
I was driving with my son back from Killington to Binghamton earlier today. Somewhere around Oneonta, NY, there was a lane closure, and there was a pretty long line of cars behind a slower moving truck. The car in front of us had a huge rooftop cargo box (don't know if it was for skis or something else), and at some point this box started moving side to side about 10 or 15 inches (I believe only one of the two attachments, probably the rear one). It was very windy, so presumably the screws holding it weren't tight enough and came undone because of the wind.
Anyway, I started flashing my headlights, honking, turning on my right turn signal, and doing everything I could think of to indicate to the car ahead that it should stop ASAP (I couldn't overtake it because the second lane was closed). Fortunately, partly because everyone was driving slowly, the driver eventually figured out that I wanted him to stop. I got out of the car and told him about the problem, he thanked me.