Many people are are misinformed about what self hypnosis is and how it can be used.
It is a natural state of mind that most people experience on a daily basis without ever realizing it. In reality it is a form of self-hypnosis. It's not dangerous because if something happens during the drive that warrants your attention, you instantly become aware of what was going on and what you needed to do to remain safe. In a hypnotic state of mind, you remain aware of what is going on around you, but you are able to disregard all the everyday sights and sounds in your environment. Focused on the important matter with which you are dealing, you are able to access your creative resources to discover the best resolution of the situation without having your emotions or critical thinking impeding your progress.