Look out all you crazy police chase loonies, I've got the perfect remedy to stop you.
The idea is this: a police cruiser is fitted with a fixed mount launching tube (about 8" long) to fire what is basically a magnetic grapple and parachute. The firing "charge" can be from an on-board 300 psi compressor and dump tank, a CO2 cylinder, or even a small Cordite gas generator. A cruiser gets close, fires the "bag" at the vehicle, it sticks thanks to some tenacious NdFeB magnets, and the parachute pops. Depending on the size of the chute, you'll be lucky to surpass 45 MPH after deployment. Now, instead of being able to kill dozens of people in your quest for glory, you're definitely caught and going to jail. So anticlimactic.
There are some important details needed here: the bag has the chute at one end, the magnets at the other. The magnets are little cubes of NdFeB and have rubber coating to prevent chipping. Each magnet is separated from the others in a series of mini-compartments like a cow's stomach. The bag itself is made of Cordura or Spectra. Around the periphery of the bag there are spring loaded "petals" with even more magnets in them. They deploy right after the bag first hits the vehicle. The chute then deploys perhaps 1-2 seconds after the petals are down.
The release of the parachute requires a mechanical setback and setforward, and electromag proximity sensor to allow release of the petals and 'chute deployment spring (thus you have a little ruggedized battery powered microcontroller unit in the mid section).
The bags should be reuseable, but even if not, they are likely only perhaps 1-2k replacement cost...far less expensive than new cars or trips to the hospital.
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