The whole picture reminds me of certain moments in life that some of us have come across or may come across.
The car is you on your journey with your own true thoughts. A realisation occurs, both empowering and fresh. But, out of the corner of your eye you notice other cars driving past you. These are other people's thoughts or more precisely, the fear of others' thoughts.
The fog doesn't help, this stands for confusion and angst in the face of this new thought. I think every great scientist and every soul with an ounce of courage must have lived that journey at some point. "I know my thoughts are right, but what will others think of me?"
Truth is a beautiful thing. One thing we need to remember is that not all truth comes easily. But it is always, always worth it.