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It seems to be some variations,may be country spesific. If you push the button when driving at the speed you want it wil be set to that speed. Then it will not go faster unless you press very hard on the gas or press the button again.
This to avoid the unvolentary speed kreep that's very easy to get in our cars..
I use the adaptive cruise control instead for this purpose, so don't find it too useful.
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