Your cruise control is defective if it's doing that. It should adjust for increases and decreases in grade, up to a point. If you're going up the side of a fucking mountain, your speed should be below the 45 mph required for cruise control and you shouldn't have it on anyway ... if you're going up and down hills, the vehicle should compensate.
Now, as far as cruise control in the rain ... you're still in control of the vehicle when it's activated. It is not autopilot. As soon as a problem is identified by the driver, ANY of the appropriate corrective measures take over from the cruise control ... braking shuts it down totally, and after accellerating, it automatically would drop back to the set speed, unless the driver brakes or deactivates it. I don't see a problem as far as maintaining control.
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