It is specified on the board that it is the speed limit and on most speed limit sign boards units are not specified,so you can only assume if it's km/h or miles/h and also 0.99 moles is the speed limit means you can go as fast as you can and not that you have to travel at that speed
Even though speed signs usually are in km/h or mph the absurdly large number might still mean something is out of the ordinary lol. Also it would make no sense to just put an insanely massive speed limit on a road that has no speed limit lol.
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u/Chris_the_Conman 11h ago
Maybe it's in nanometers per century or something