This is way off topic, but it is related to electronics, and
could theoretically be related to PIC's... :-)

Modern cars have ABS brakes, which is a system made to
prevent the wheels from locking up.

This system have sensors on the wheels that senses whether
it is rotating or not. Usually it is sensing on a toothed disk of
>some kind. (Probably some kind of hall-effect gadget)

This is perfectly suited to sense if there is rotation or not.

But here comes the interesting part:

How can a car with ABS brakes come to a stop in a hill?

Why don't the ABS-system release the brakes when the car stops?

And now you might say that the ABS-system is deactivated below
a certain speed, which is absolutely correct.

But what if a car standing still starts to slide? Will the ABS-system
be able to release the brakes?

Just wondering....


-Oyvind