On highways, when the posted speed limit is 70 MPH, the minimum speed limit is:

30 MPH.
35 MPH.
50 MPH.
There is no minimum speed limit, it is always safe to drive slowly.
Explanation

On highways, when the posted speed limit is 70 mph, the minimum speed limit is 50 mph unless otherwise posted. If you drive below the minimum speed limit, you may block the flow of traffic, irritate other drivers, and possibly create hazards. Always aim to drive with the flow of traffic and within the speed limit.

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