Explanation should include

highway rules and regulations, according to NASD and the Virginia Department of Transportation (VDOT)
universal hand signals
precautions when entering traffic
lighting and warning systems
stopping distance
equipment stability at highway speeds
travel time difference between automobiles and agricultural machinery and/or equipment
traffic signs.

Process/Skill Questions:

What is an SMV sign, and what does it mean?
Why are the brake pedals locked together when operating farm machinery on the highway?
What are the differences between traffic laws for automobiles and agricultural equipment?
What are the requirements for a person who is going to operate farm machinery on public roads and highways?
Why is it important to ensure all caution lighting systems are operational prior to highway use?