Cops are human lie detectors, playing dumb with them never works. OTOH acknowledging this fact straight away seems to make them happy.
The simple reason why you always want to know what the police accuses you of before you admit to doing anything is that they might know less than you think. (That’s exactly why they ask you!) You should never lie to the police, you should just politely ask them why they stopped you. What’s wrong with that?
The first thing I say is "I'm sorry officer. I know I was why I got pulled over. I just excuse for it"
Has worked every time.