The Gina cloth-covered car is a prototype vehicle from BMW that is covered with fabric rather than metal. Like a living animal, its skin wrinkles a bit when elements are extended (like opening the doors). See it move in the Gina video below.
(Video shows moving fabric of Gina fabric-covered car)
The shape of the skin can be altered by the car's owner; it is stretched across flexible metal wires attached to the frame that can be moved with hydraulics.
The fabric itself is a silver expansion-resistant textile that is form-fitted to the car's structure. "The high-precision fit of the material to the metal mesh also allows surface changes without slackening the tension," a spokesman said.
Police cars would need an advanced surveillance-style fabric; consider the sonomagnetic fabric used in David Brin's Earth as a fictional start on the idea.
I think everyone would like to cover their car with Zetix Blast Resistant Fabric, which is a real-life analog to the super suits of comic book characters.
Orb Nomad Zero-Emission Electric Aircraft
'That explains how it was so easy for me to remain motionless in midair or to perch on a flagpole in imitation of a giant bird, even in the windy city of Chicago.' RH Romans, 1929.
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'Space-sickness is one of the most unpleasant sensations that a human being can experience. Not all are subject to it...'
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'It was a relief to enter one of the comfortable autos, whisper a direction down the tube, and just know that you would be taken to your destination in the quickest, safest, and cheapest manner.'
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'The vast spinning sphere of Factory in the Sky loomed above and ahead of us, gleaming white against the unfathomable jet depths of surrounding space.'
The Solar Oberth Slingshot
'And if it doesn’t work,' inquired Lazarus, 'what does that make us? Sunspots?'
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'Our study of your race has convinced us that you are not fitted to leave your planet in the present state of your civilization.'