Never used those, AFAIK you don't see those often over here
(Germany), perhaps they are even illegal? They might not have big
influence most times, but could produce bad results during an
emergency stop from Vmax to 0 km/h. Imagine braking distance
would get just 1 m (3.23 ft) longer, which could make the
difference between crash and just stopping with pretty hot
Anticipatory driving style does in fact reduce break dust, fuel
consumption and doesn't make you really slower.
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