That map looks like high scores in an arcade game encouraging you to beat them. Can you beat the 276 km/h (!!) or 247 km/h on what seems to be a long tunnel or a bridge?
Is there any documented effect of that data being public to people trying to "beat" the speeds?
The data is open and there is a nice website showing the top speeds: http://www.bestwelsnel.nl/ (best wel snel = pretty fast)