How much can you exceed the speed limit on the highway?

[JoshuaFitz]

Highway speeding is not allowed, and motor vehicles must not exceed the speed limit. Below are the specific details regarding speeding violations: Exceeding 20%: Driving medium-sized or larger passenger vehicles, school buses, or hazardous material transport vehicles on highways or urban expressways at speeds exceeding 20% above the posted limit, or driving such vehicles on other roads at speeds exceeding 50% above the posted limit, as well as driving other motor vehicles at speeds exceeding 50% above the posted limit; results in a 12-point penalty. Not exceeding 20%: Driving medium-sized or larger passenger vehicles, school buses, or hazardous material transport vehicles on highways or urban expressways at speeds exceeding but not reaching 20% above the posted limit; or driving such vehicles on other roads or driving other motor vehicles at speeds exceeding 20% but not reaching 50% above the posted limit; results in a 6-point penalty.