I think that by then you will be passing cell towers fast enough that
you can use that reference.  Or detect the color shift in a flash
picture.

On Jan 17, 12:05 am, metal mikey <[email protected]> wrote:
> Will this still work as the car approaches and quite potentially
> breaches the speed of sound???
>
> On Jan 15, 4:59 am, DanH <[email protected]> wrote:
>
> > It only takes one phone:  You have the phone generate a tone and
> > detect the shifted tone off of whatever object reflects it, like
> > radar.  ;)

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