Final answer:
The subject of this question is Physics and it involves understanding the varying speeds of roadways that carry a low volume of traffic.
Step-by-step explanation:
Physics can explain the varying speeds of roadways that carry a low volume of traffic. In this case, the roadways can have speeds ranging from 25 to 55 mph. Physics principles, such as Newton's laws of motion, can help us understand the factors that affect the speed of vehicles on these roadways.