Final answer:
Commercial drivers can be exempt from keeping log books depending on distance traveled, vehicle type, and cargo, such as those operating within a 100-air-mile radius or certain agricultural and emergency service vehicles.
Step-by-step explanation:
The question 'Who is exempt from doing log books?' likely pertains to the regulations involving commercial vehicle drivers and their requirement to maintain Hours of Service (HOS) records using log books. There are exemptions to this requirement that depend on a variety of factors including the distance traveled, vehicle type, and cargo. For instance, commercial drivers operating within a 100-air-mile radius are often exempt from keeping a log book. Similarly, drivers operating vehicles for certain agricultural purposes or emergency responders may also be exempt. It's important for drivers to understand their obligations under the law, as the rules can be specific and violations can result in fines or out-of-service orders.