Had one quite a few years before this that wasn't cool. I got clocked doing 38 in a 40. City cop wrote me for 38 in a 30.
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These days, I don't get pulled over for speeding as I just don't speed. It's a pretty easy way to avoid it.
Based on your first experience, I'd say that the evidence shows that even driving the limit doesn't avoid getting accused of speeding. My experience is the same:
Years ago, I was driving back to the Twin Cities from Pacific Junction, Iowa, where I was attending a two-day "advanced driver training" event at Mid-America Motorplex. It was after dark on a Sunday night just north of Des Moines and my trusty Valentine One radar detector went off... radar ahead. I slowed down to the limit, set the cruise control, and continued to pick up blips from ahead of me. After about 20 miles of this, the cop slowed down to about 10 under the limit, at which time I quickly caught up to him and passed him. The minute I get back over into the right lane, he pulls me over. He gave me a written warning for "72 in a 65", even though my speed was never higher than 65 (as verified by GPS).