Yes you can successfully (sort of) contest a traffic ticket in Quebec
Thanks for all the responses.
Well, in March, I was in touch with an official of the Quebec justice system, who told me that my case had been reviewed and that he was empowered to lower the offense.
The end result would be a significant reduction in the fine. I was told to fax a signed statement where I pled guilty to driving 120 km/ hour in a 100 km zone (compared to the 160 kms I was wrongly charged with). I did so. Two months later, I recieved a bill for $111 (versus $199) which I paid via credit card.
Not counting the police officer who stopped me in the first place, everyone i dealt with was very nice.
WEe loved Quebec and will freturn. My wife will drive.