Overtaking graphic mod?

Do you know of a mod that displays a small graphic so you know just how close you are to another car when going wheel to wheel with someone? After all, in a game you have no peripheral vision, and changing the view to take a peek can result in you crashing into them anyway! What I mean is a small graphic showing the two cars side by side and the distance between them. It would be so cool to be able to safely move over on someone while knowing how far from contact you are.

I didn't mention a specific game, as I believe such a mod would benefit all racing games.

Mobo: GA-P35-S3
CPU: Intel Core 2 Duo E4400 2Ghz
GPU: ATI X1950XT 256Mb DDR3
RAM: Kingston 1.Gb 240pin DDR2 PC667Mhz PC5300
Sound: Audigy 4