81 kilometers an hour is 50.3 miles per hour. That is the maximum speed that lions, wildebeest, and hares can run. 80 km/h is the Canadian speed limit on most two lane roads outside of cities. The slowest you are allowed going on an American interstate is 40 mph, but some states like Colorado, Florida, Indiana have a maximum speed limit of 50 mph on interstates when going through major cities.
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