Were you caught by State or Local Police? If State they have Radar. If Local they have only Vascar, lines on road. How fast were you going over speed limit. I would suggest you go to court UNLESS you disrespected the officer. If you didn't show the highest respect you might be wasting your time.
Try looking here. It's free.
http://www.motorists.org/fightticket/
There are others so search on web.
If you were caught using Vascar there is usually a gray area before they issue a ticket unless it's in a school zone, active or not. Do some research on web about Vascar and PA Supreme Court on rullings.
In PA it's You the Officer and Judge with no other people in court room. I hope you can talk to officer and it will be excussed by Judge or maybe changed to a lessor charge, no points. They have heard most all excusses.
I have been very fortunate by not loosing in court.
GOOD LUCK!!!!!!!!!!!!!!!!!!!!!!!!!