alt Hacker News100kph is rather slow. Relative speeds of cars exceed that regularly even on city streets. Relative speeds in excess of 200kph are common outside cities.
100kph is rather slow. Relative speeds of cars exceed that regularly even on city streets. Relative speeds in excess of 200kph are common outside cities.
In case anyone else made the same mistake as me:
I wrote a whole paragraph, then realised that "relative speeds" is the sum of opposing speeds, ie. two cars going in the opposite direction at 50km/h each make up a relative speed of 100km/h.