Why it matters: Autoweg and autosnelweg: G3, G1 and the speed rules

These rules exist because a motorway only stays safe if everyone on it can at least keep up with the flow — a slow vehicle among cars doing 100+ km/u is an obstacle that suddenly stands still. The list of prohibitions prevents exactly the situations where that happens: U-turning, reversing, or stopping in the middle of a road with no at-grade junction, where nobody sees it coming. And the two-right-lanes rule for long combinations keeps the left lanes clear for faster, more manoeuvrable traffic.