What is the meaning of a sign that indicates to 'Keep a minimum speed of 25 mph'?

A sign indicating "Keep a minimum speed of 25 mph" clearly communicates that drivers are required to maintain a speed of at least 25 miles per hour. This is enforced as a minimum limit to ensure traffic flow and safety, particularly on certain types of roadways where slower speeds could cause hazards or congestion.

In this context, maintaining a minimum speed helps to prevent unsafe driving conditions that can arise from significant speed disparities among vehicles, especially where higher speeds are expected or necessary for the safe operation of the road. Signs like this are typically placed in areas where driving too slowly could obstruct traffic and increase the risk of accidents.

Other interpretations, such as suggesting a speed or indicating a maximum speed, do not align with the explicit nature of a minimum speed sign. The sign's directive is straightforward: drivers must adhere to the minimum speed regulation provided.