Speeding Conveyance Deterrent

Rather than risk the well-being of law enforcment officers in busy traffic situations or to over exposure to radar emmisions; I propose that a system of pop-up speed bumps be placed, in strategic locations, that are activated, by speed sensors. As the speeding conveyance approaches, the system would then project and lock parking block-like structures through the roadbed, directly into the path of the speeding offender. The only potential problem with this design is that some errant tire manufacturer may design tires with valleys arrayed about the tire that could mate with the protrusion and thus nullify the speed bumps. I am sure that when the government carefully studies my system, they would immediately outlaw such ridculous conter-measures as these in light of the risk to public safety they pose.