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Twenty years ago, automakers won exclusive rights to use a portion of U.S. airwaves for ultra-safe "talking cars" that would communicate with each other wirelessly, seeing around corners and averting collisions.

That future hasn't arrived. And now with just one talking vehicle on the roads -- a lone Cadillac model -- cable providers want to loosen automakers' hold on the frequencies.

NCTA-The Internet & Television Association, a trade group with members including top U.S. cable provider Comcast Corp., on Tuesday asked regulators to open those airwaves for use by Wi-Fi signals that will shoulder more and more of cable subscribers' traffic.

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