Not an ANCAP related feature, but something that seems to be becoming more common in new cars...engine stop/start.
This, for those that don't know, works by stopping the engine when you come to a stop at traffic lights and intersections etc then restarts when it's time to move off.
Well, I find it an utter pain in the bum...
How much fuel are you likely to save, a thimble full? There is obviously extra wear and tear on the starter etc for what real benefit.
Manufacturers do give you the option to turn it off but like most ridiculous features these days, they default to on when you restart the engine... 
Not an issue in my Golf or Tiguan, and the silence is wonderful.
In heavy city traffic, especially congested in the CBD, and on the Motorway, it can save quite a bit, as idling is the least economical.
It is mostly about reducing carbon monoxide poisoning of the people sitting in the stationary cars all sucking in each other's fumes. Carbon monoxide makes people drowsy, which leads to accidents. Cardon monoxide also contributes to smog.
PS. Stop/start engine management is a problem I don't have in my EV.
Pedal up, stop. Pedal down, go (fast).
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