For beginners, driving regulations strictly prohibit getting straight onto the highway. If your driving skills are lacking, never mind the poor experience, it is a very good way to get yourself killed.
However, many people have plenty of theoretical knowledge while their bodies have yet to become qualified veteran drivers. Such people are likewise advised against taking the highway, because it is easy to misjudge a curve and overtake prematurely. While experience makes a rollover less likely, a body unaccustomed to the speed still easily crashes.
Liu Chuanfeng meant nothing by this; he was simply talking about driving.
Chapter 332