To dream of a highway represents situations in your life where you are experiencing momentum or progress. A situation is moving along quickly.
If you're pulled off to the side of the road, have an accident, or find yourself driving a vehicle in poor condition it may symbolize problems or emotional issues you are experiencing during fast paced situations. Difficulties or delays you are having while "moving ahead" with something.
To dream of getting into an accident with another car on the highway represents conflicting ideas or agendas during a fast paced or progressive situation. A fight with another person while experiencing a life situation that is moving quickly ahead.
To dream of getting lost on the highway represents feelings that a face paced situation has left you feeling way in over your head. Feeling that a life situation has moved much too quickly for you. A sign that you need to slow down or ask for help. Insecurity about losing your sense of direction or purpose during a high momentum situation. You may have "gotten ahead of yourself" by moving too quickly.
Example: A young man dreamed of having a head on collision while getting off the highway. In waking life his friend found out that he slept with his ex-girlfriend whom he had just broke up with. The highway reflected the fast pace of the adulterous relationship.
Example 2: A woman dreamed of driving on the highway as fast as she could while having no idea where she was going. In waking life she was searching for the right university program to enter, but had no idea which school was best to attend.