>Just a thought, could you encode data in the line you're following (like a
>coarse barcode) to warn of an upcoming curve, straight, end of circuit etc?
>That would give you more time to apply brakes etc.

That would be a sneaky one, you probably do not need to encode much, just a
dash length which determines the vehicles speed, and it locks onto it PLL
style, it adjusts its speed so the frequency of the dashes under the sensor
is constant.

It would need a bit of experimenting to get the dash length correct so the
vehicle does not wander, especially at low speeds, during the inter-dash
interval.

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