One of those images where you get to decide what you want it to be!
Driving home from a city at night* is a great way to get some very interesting photographs, if you are prepared to experiment and play. This was actually taken at dusk and the colours are the result of the pink glow on the skyline, the car lights and the various signs as they were lit by the traffic.
These multiple exposures are all on my When Life is a Blur Gallery
*I was a passenger, I should add before I am flooded with horrified comments about how unsafe this practice would be if I were at the wheel.