Unless you and the other person are intentionally racing each other at the lights, you won't know if the person is really pushing his car or not.
I once had an WRX in front of me at the lights and when it turned green it "seemed" like he was flooring it so I followed suit and was able to tailgate him till the next lights. I say "seemed" because I don't even know if he was really gunning it or just going fast.
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