Ha! A shot I've attempted myself, but you pulled it off better than I ever have. I love how everything's in focus, including the text on the mirror, and you clearly either rolled down the window or have much cleaner windows than on MY car. I also adore how the cloud line is contiguous between 'sky' and 'reflected in window'.
This is a very well executed picture.
First of all the exposure is very good. You captured this beautiful dusk (dawn?) light very well. The resulting soft colors are wonderful. The exposure chosen also allows the cars in the mirror to be sharp, in contrast to the road on the side of car.
About the composition, I think you couldn't have done much better. Each element of the picture has the correct level of importance. I also like the reflections on the car, reflected itself in the mirror...
The image in the mirror could be a bit sharper, but to take a crisp picture in a moving car with this amount of light is not easy...
My main criticism about this entry is about relevance to the theme. Of course this is about cars, but for me this image doesn't convey too much the idea of transportation. I think this is due to the fact that the main subject here are the cars in the mirror. And those cars appear still since you move at the same speed as they do.
But this is a minor criticism, this image is perfectly executed. Very well done.
Good concept, great colours! I like the blurred purple on the side and the contrast it offers to the clear image in the mirror. I'm glad this was taken from the passenger seat! LOL! - 10