I think your suggestion would be enough. If you're interested enough to want to know then this gives you the opportunity to easily find out. You'd just need the website, spotters guide or race programme to tell you.
During a 24 hour race and the practice before you'd get to learn it for the cars that you care for.
You could go the whole hog and have some system that showed the drivers name, but I'm not too fussed. Give me the opportunity to tell.
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