Back in March "rafita" shared (HDRI's on the directory) some HDRI sources from crazy8studio- they are really neat! I dusted off my SolidWorks model of the famous 1927 Miller 91 front-wheel-drive Indy car, and tested the HDR called "track". Today "hagey" shared his renderings made with "rockhall", I believe. These are really high quality environments well worth looking at. Bear in mind that they are free, and protected by a Creative Commons License.
I did Photoshop out some unwanted traffic cones and light standards, but otherwise they are just as rendered. It's rare to find an HDR that's such a perfect fit.
Visit www.crazy8studio.com (http://www.crazy8studio.com)
Side note: I'm often tempted to rent a motor home and spherical camera, and "hit the road" for a couple of months. We really need a broader choice of HDRI's and backplates. Like a "curving bridge high in the American Rockies", or a "real" racetrack.
Bill G
www.GouldStudios.com (http://www.gouldstudios.com)
Great work Bill ! The only thing I would fix is the tires. They look like they are not sitting on the ground. I run into the same problem.
Egon