Answer: An Isolate
Step-by-step explanation:
An Isolate is a person who is separated from others and so does not communicate with others a lot. This person most likely prefers to be alone and can do without human company or communication for extended periods.
Micheal is usually out on the road which means he is often separated from the rest of his colleagues and on top of that he infrequently communicates with them which are signs that he is an isolate.