Given your lack of previous convictions, you will probably be offered a plea-bargain to a lesser speed. It's your choice if you want to take that or not. Speeding cases are not so easily won. In almost all instances, they are won on technicalities. Some examples include: failure to provide disclosure by the Crown; no notes about testing the device before and after the stop; officer did not properly test, and/or did not properly use the device; lack of proper tracking history (officer must first observe the vehicle is speeding visually with his own eyes, THEN activate the speed-measuring device to confirm); vehicle was stopped but only after sight was lost, and it is questionable as to whether the correct vehicle was stopped, etc. What do the officer's notes say?
Speeding is an absolute liability offence. Once they've proven that you committed the offence (hence, the technicalities as a defence), the only remaining defence is "necessity." This implies a serious emergency was underway and you had to exceed the speed limit in order to properly address it (e.g. someone in your vehicle was suffering a heart attack and you could not wait for an ambulance).
As for the court time... just make sure you are appropriately dressed, be polite and respectful with the JP, etc. A lot of people go in there wearing ripped jeans, t-shirts with interesting words and expressions on them, baseball caps on backwards, track pants, etc. If your appearance is neat and tidy, the chances are that you'll be given a lot more respect - and probably a better deal - if you choose to go that route.
Good luck.
* The above is NOT legal advice. By acting on anything I have said, you assume responsibility for any outcome and consequences. *
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