Couldn't you argue to a police man who has pulled you over for speeding that the speed limit sign didn't propose in which direction it was not allowed?
Also, wouldn't you have to be on a flat plane in order for it to be velocity? If you're going over hills and such or around curves it would be speed...
It would actually be acceleration, because acceleration is a change in velocity, and your velocity is changing over a curved surface. Your speed isn't changing, but because velocity is a vector, the direction is changing. This means it's accelerating
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