When driving on an interstate highway, drivers must know that:

A minimum speed limit may be posted.
They should never change lanes.
They should change their speed frequently to keep up with the flow of traffic.
Vehicles may travel up to 95 MPH.
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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