(a) The chairman of the Texas Transportation Commission is an agent for service of process on a person who is a nonresident or an agent of a nonresident in any suit against the person or agent that grows out of a collision in which the person or the person's agent is involved while operating a motor vehicle in this state.
(b) Process may be served on the chairman in accordance with this section for a nonresident who was a resident at the time the cause of action accrued but has subsequently moved from the state.