b. 56mph c. 60mph d. 64mph represent the same level of accuracy when compared to the speed limit sign. As the speed limit on the highway is 65 miles per hour and the speeds mentioned above are below the speed limit.
More about speed limit:
The legal top speed at which a vehicle may travel on a specific section of road is determined by speed limits for road traffic, as they are utilized in the most of countries. On a traffic sign, the maximum allowed speed is typically displayed and expressed in kilometers per hour (km/h) or miles per hour (mph).
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