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I doubt that they can use this data to track individual devices. They could conceivably use tower triangulation to track signal changes and the rate of those changes as the vehicle moves, but it's not exact enough to determine the exact vehicle speed.
Now if the mobile companies could use this potential speeding vehicle info to then access the GPS data in the mobile device they will be able to get (and record) the same detailed vehicle speed information that your phone, or any GPS based apps, can obtain.
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