"Minimum speed signs are designed to: A. Show current local road conditions. B. Assure pedestrian safety. C. Keep traffic flowing smoothly. D. Test future traffic signal needs."
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Step 2
: Analyze the Purpose of Minimum Speed Signs

Minimum speed signs are primarily designed to keep traffic flowing smoothly by preventing unnecessarily slow driving that can disrupt traffic patterns and potentially create hazardous conditions.

Final Answer

Keep traffic flowing smoothly The primary purpose of minimum speed signs is to ensure that traffic moves at a consistent pace, preventing unnecessary slowdowns that can create potential safety hazards and traffic congestion.