Take the picture while traveling as close to the speed of the car as you can?
I’m sure your alderman would add another couple lanes for you.
Get the car further from the background and use a wider aperture? It’s not motion blur, but it might look that way, in the dark, if you squint right.
Have him drive even closer to the background so the difference in speed is more pronounced.
Set your camera on a tripod and pan along with the car, though that might only work with telephoto lenses. I’m not sure how distorted it’ll make it look having never tried it and using only reckless conjecture.