I was going 90 in a 40. It was 2 am and I had been driving for 8 hours. I knew there was a little store and I was heading to it to get a coke and walk around. I told the cop that, he followed me to the store and I did walk around and get a drink. He just told me to be be careful. I did not realize I was going that fast for I’m very careful with my speed usually.