I think it is possible that there are therapy programs that address specific fears like you have described. You can ask your doctor to help you find one. You didn't say what kind of terrain you are traveling on, if it is icy mountainsides that's one thing, but if it is suburban side streets, another. For the short term, you could try planning your route to be what you consider the safest streets, and wearing your seat belt, etc. These are rational approaches to what you consider to be an unsafe situation. I realize you will still have the fear (although perhaps this will lessen it to some extent) but the reality will be that you have made yourself as safe as possible while traveling in a vehicle. You can do these things before you get therapeutic help. I hope this helps you in the short term. I send you