If you are stopped by a police officer for the offense of speeding, one of the most important things that you can do for your defense later is to be observant. Observe what area you are in. Note if it is an incorporated or unincorporated area of the county. Note if there were any cell phone or microwave towers in the area.
Lastly, note the distance when the patrol vehicle was first observed to be clearly visible if it was stationary at the time of the offense.
Now let's look at the reasons why you should be observant of these things. If you choose to challenge the ticket in court, the ticket can be dismissed if the presiding judge does not have jurisdiction over an incorporated or unincorporated area of the county. Many tickets are written in a particular area, but the court in in a different area of jurisdiction.
Secondly, cell phone and microwave towers can impair the reading of the radar equipment used by the policer officer. Question, or have the officer questioned as to whether either of these things were present. If the officer does not know, then his or her credibility is questioned, and the ticket can be dismissed.
Lastly, many states and areas have a required distance that a police vehicle is visible to traffic. For some it may be 300 yards, for some it may be 300 feet. Do a little research and find out the visibility distance. If the police vehicle was not visible within the required distance, then the ticket can be dismissed.
Now here's an additional tip... slow down, it's not worth it.