Yes, but again, the officer is trained and unbiased. Your statements about your speed are definitely biased. Furthermore, you have already admitted that you really don't know how fast you were going.
So, here it is: We have the unbiased testimony of an officer who has been trained in, and who is well practiced in, timing vehicles using Accutrak vs. the accused driver who doesn't know how fast s/he was going and who has every reason to lie (not that you would) in order to avoid the recriminations of being found guilty of speeding.