I noticed you only had b/w images for Techno Drive, I've managed to locate some decent ones, check my emustatus update, for some enhanced ones, the originals were here:

http://hoizinger.com/ed/tdgame.htm

It appears to be the developer's site.

Where did you get the Ridge Racer images from? I've been looking for them for over two years now!!! Because of the sequels and home conversions, any type of search was impossible (10 million pages found, 99.9% = crap).

I'm going over your Namco section to find titles for missing driving games in my timeline, so I may uncover more screenshots.