This has nothing to do with the article really, but stupid signs will always be a problem as long as they exist. In Austria, there are signs on the highway that

This has nothing to do with the article really, but stupid signs will always be a problem as long as they exist. In Austria, there are signs on the highway that allow electric cars to obey a higher speed limit (130 Km/h instead of 100 Km/h; https://autorevue.at/ratgeber/ig-l-immissionsschutzgesetz-luft https://autorevue.at/ratgeber/ig-l-immissionsschutzgesetz-lu... ) provided they have (optional, but now standard) green number plates. My car doesn't know that it doesn't have the green plates, so it cannot know what limit to use. Also, it can't look up the paragraph quoted on the sign to read the current version of the law, presumably.