Human reactions however, have not. Don't know where you live but most EU countries have a speed limit of around 100 km/h on the highway. This gives a stopping distance of around 100m for a modern well-maintained car (Which, let's be realistic, most are not). That's a long distance. Now if you take into account that a lot of countries have higher limits (France at 130 km/h for example) and that the braking distance increases exponentially I would disagree that they are outdated.