They don't rise beneath the vehicle, they stop when the vehicle starts to pass over them. the car goes up when it hits them for the same reason it goes up when you hit a curb....the shape of the vehicle and the path of least resistance until the forward motion is dissipated. Your insistence that they are violating the law is based on your ignorance of what is actually going on. 
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The descent of man ~ Nixon, Friedman, Reagan, Trump.
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