Good advice thus far Deedlet, not too much to offer other than a slight alternative in terms of interpretation.
Cars (vehicles) equate with ones state of awareness, rather than the physical.
Just as a car is a vehicle which transports us through the physical side of life, so does our awareness act as a vehicle for the indwelling intelligence to experience life on the physical plane.
Red is the color of desire, but also anger. Anger is not always bad, it can indicate the desire to fight. And it is usually when we are angry that our "be nice" and "pity me" programs drop away, in short, we achieve clarity when we are angry if the emotion is used properly to bring things into focus.
That requires being detached and objective, however. If we "consider" as Gurdjieff uses the term, or if we identify with the emotion, then all too often it becomes destructive and uses us rather than being used constructively.
If the car = your state of awareness and "hits you" suddenly, seemingly out of nowhere, perhaps it is a warning about suppressed anger coming out of nowhere and "blind-siding" you.