How do you fight a speeding ticket in Tennessee with CDL license?

Show up to court at the location specified on the summons then plead "not guilty" and explain why you think you should not have been given the ticket. One way to avoid receiving a speeding ticket is to be cooperative with the officer. You could also get a plea bargain agreement to get a reduced charge prior to seeing the judge. If you need to argue your case (e.g. "fight") is to provide information that you have had no prior tickets or any points on your driving record, but this would depend on the state. And, one way that means a quick trip is to own up if you are guilty and pay the fine--no judge, no court date... just embarrassment and possibly a raise in your insurance and whatever points on your license.