A few flashes of the headlights and some short blasts of the horn as you go by is what I would do. I've had people do this to me when the lighting board was about to fall off my trailer and it got my attention. Don't try to make eye contact or mouth anything through the side window as that is dangerous for both people.
When the first car comes past doing this, the driver may think the person trying to tell them there is a problem is being aggressive. However when the second, third, fourth car comes past doing something similar, most people will twig that something is wrong and pull over to check.
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