How do they enforce speed limits without mandating bike speedometers?
I can see how how pointing a laser gun at the top of a wheel could double the speed (or pointing at the bottom could neutralize it), but I don't see how you could get speeds of hundreds of MPH unless you were going above 50 MPH.
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Cars kill 45,000 Americans every year.
This is like losing a war every year, except without the parades.