Very nice piece of writing (don't see enough of that on Dreamviews nowadays, good use of robust metaphors, easy-to-follow orginization of thought in sentences and tutorial as a whole), and a great tutorial, to boot! I do have one question, however...

The worst thing that you could do in that situation is think “This is my dream, I don't care about cars coming to hit me...” then discard the thought.
Are you warning against the thought, or against the discard of the thought or the car? Because, I really do like this thought. It can be used to face nightmares, and it is a sign of higher lucidity. Discarding the thought of the car completely is probably a worse idea--it might not work in a dream to rid yourself of the car, and it hurts your visualization techniques.

I just want some clarification~