Half the time I see someone using a tarp on the highway, it looks like a wreckage scene from the movie Waterworld. Why is that?
A tarp under wind pressure suffers the forces of a net, airplane wing and a whip all at once. Care should be taken to keep it from behaving like a flag or a kite. All the corners should be tied down so that it cannot be move in any direction. Extra crossing ropes would not be a bad idea, and all cargo underneath should be secured independently of the tarp, to keep the tarp from having to do the job of a net. Since it is easy to underestimate the forces of wind on a tarp, highway travelers will continue to entertain (or frighten) us.
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