On interstate highways with four or more lanes, what is the minimum speed, and what is the minimum when the posted limit is 70 mph?

On interstate highways with four or more lanes, what is the minimum speed, and what is the minimum when the posted limit is 70 mph?

• A. 50 mph minimum; 40 mph when posted limit is 70.
• B. 40 mph minimum; 50 mph when posted limit is 70.
• C. 60 mph minimum; 75 mph when posted limit is 70.
• D. 40 mph minimum; 70 mph when posted limit is 70.

Answer: (B)