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>Or, alternately, have the lanes marked.  Far left on a four lane is 70-80MPH,
>middle two lanes are 55-70MPH, and far right is 45-55.  Put small sensors
in the
>pavement which tell the car's speed, and if the driver doesn't stay within
the
>range (give them a few seconds to allow for lane changes) then use a
buried EMP
>coil to disable his/her car.  s/he will have to coast off to the side and
wait
>for a tow truck (which will already be on its way).  The cost of towing and
>replacing certian modules will be enough incentive to encourage them to stay
>within the bounds of the lane speeds.


If you're going to mark them, then stripes at a regular time interval could
calibrate a cruise control.
It would be pretty trivial to filter out vandals and road junk, but if you
had the option to set a cruise and KNOW that it was legal, and not going to
creep up or be ceeped up on, I think that would make for a more pleasant
journey.

This also keeps the low-tech stuff on the pavement, and the high tech in
the car, where it's easy to maintain.

(FWIW: I think you can also play music by grooving the road appropriately) :)

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