When driving on an interstate highway, drivers must know that:
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Vehicles may travel up to 95 MPH.
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They should change their speed frequently to keep up with the flow of traffic.
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They should never change lanes.
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A minimum speed limit may be posted.
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Explanation
Some interstate highways may post a minimum speed limit in addition to the maximum. This is to ensure that vehicles aren’t moving so slowly that they disrupt the flow of traffic or pose a hazard. Driving too slowly can be just as dangerous as speeding, especially on high-speed roads. On interstates and freeways, drivers are expected to maintain a steady speed and match the general flow of traffic-without unnecessary speed changes or weaving between lanes.
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