The highway in dreams indicates your ability to go from one chapter of your life to another. The highway also indicates the things that happened for you in the past, the situation you are at the moment and the future that you are creating for yourself. If you are unable to move while being on the highway or do not know which direction to choose, then such dream shows that you tend to be in doubt about some issues in your waking life. If you went off the highway while driving, then such dream suggests to pay more attention to minor details instead of focusing only on the main ones. If you had an accident while being on highway, you should be careful with your surroundings.
Read more about dreaming of Highway in other dream meanings interpretations.