> They’re doing this in Reykjavik as well which is great, although enforcement is poor so on the larger roads that are now 50km/h everyone is still driving 70km

> They’re doing this in Reykjavik as well which is great, although enforcement is poor so on the larger roads that are now 50km/h everyone is still driving 70km/h as they were when the limit was 60km/h. The car speedometer is conservative so it is several kilometers behind, and the speed camera allows in the Netherlands about 3 kilometers margin. In practice this means you can drive about 107km/h indicated car speed on a 100km road. That said, lowering the speed on a road should not only be achieved with different signs but also with traffic calming - so redesigning the layout of the road.