You're right, I did forget about the wheels. Part of the learning process, I guess. Thanks for pointing that out to me. The wheels could be done by selecting the tires and wheels using the same method as the car, with perhaps a smaller diameter selection tool. Then using the Filters-->Blur-->Radial Blur Filter. Again, I'd be careful not to overdo it.

Thanks for your comment, Zack247.

just remember if you are doing radial blur, the more circular the view of the wheel the better. use gaussian for wheels that are more ovalsih in the picture.

and overdoing it can be pretty easy considering you have 360 blur ratios to choose from.