Griped publicly on Twitter about all the ridiculous Friday the 13th twaddle on official Dutch motoring and weather Twitter accounts today. Then colleague shunts car on the way to work. I put it down to the Dutch being really shitty and impatient drivers who do not understand the wave mechanics of a column of slow-moving traffic. Science wins.
(pen) If Dutch cars are governed by the laws of wave mechanics they must equally be subject to Heisenberg's Uncertainty Principle and if they know where they are they've simply no idea how fast they're going. An accurate speedo though simply means the satnav won't work and they could be anywhere, Rotterdam, Novosibirsk, Betws-y-coed etc. Science doesn't just win, it tramples you to death.
If the answer is 'I don't know', then you're still in the multi-storey carpark. Don't expect any clues about which exit to use to get out to get on the way to your destination. (By the way, don't call it a SatNav in the Netherlands. They have no idea what you're talking about. You have to call it a Tomtom.)