Yes but...you can still be speeding and NOT guilty. Example..
Speed limit = 25
Your speed = 30
Cop's ticket = 35
Assuming you take the stand, prosecutor asks you (or your witness)what speed you were going. You say 30 and explain that you've been charged with going 35 of which you are not guilty. The judge, if he/she believes you...should find you not guilty as you were charged for going 35!