Being hit by a car is read as being blindsided by an event or a person. Dream books link it to feeling knocked off balance by circumstances, and see it as an image of shock rather than a prediction. Stepping out without looking points to haste or distraction, while a car that comes from nowhere is read as a change that arrived too fast to prepare for. Getting up unhurt is read as resilience, and seeing someone else hit as worry for them. If you are the driver, it is linked to fear that your actions hurt another. It can help to notice what has caught you off guard lately.
Does the traditional reading fit your dream, or did it mean something else to you?
My Cosmic Code has a private dream journal. Write a dream down and the app picks out the symbols in it, shows what dream books say about them and, over time, which words recur across your entries. The journal is stored on your device only.