Winning a traffic case
There are two ways to win a case.
1. Have the case withdrawn by the police
2. Plead not guilty, go to a hearing, and be found not guilty.
That said - the concept of 'winning' a case can be too narrow - I find it more important to determine the overall result or outcome sought. E.g. If you are at risk of losing your licence you can 'lose' the case (be convicted) but ultimately save your licence which is the result you want.
I've successfully defended across the spectrum of traffic cases including drink driving, driving while disqualified, and boy racer charges.