Speed signs and speeding
If the road speed is zero, and the surface is not moving. For pure rolling to occur, all points of contact on the surface must also have zero speed. For the tyre's to speed then the tyre's have to be slipping.
Speed kills
The belief that "speed kills" is not necessarily true. For instance, traveling at a high speed in an airplane at 500 miles per hour did not result in my death.
The truth
Impacts kill if there is no impact then there is no injuries, but this is not always true If one were to drive over a child at .5 kph the child might not survive because of compression.
So why are the laws written the way they are?
1 They were written by people whom had no clue! (Politicians)
2 They wanted to make a genuine mistake illegal because this would make everyone personally accountable for their actions. (even politicians)
in Summary
The laws regarding speed limits may have been written by politicians who didn't entirely understand the science behind them, and they may also be designed to make innocent mistakes illegal!
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