going straight on green light (Hwy 410 + Williams Pkwy) in Brampton
 

I was going straight on green light (Hwy 410 + Williams Pkwy) in Brampton and got a ticket. Officer told me that I cannot go straight on this light and there is a sign. I went back to the intersection and checked and there is a sign that left turn is allowed. There is another sign that right turn is allowed. But there is no sign that going straight is not allowed.
Ticket:
Offence: Disobey Sign
Section: Highway Traffic Act 182(2).
Questions:
1.Is officer correct giving me ticket?
2. Can I go to prosecutor and if does not agree can I go for trial.
3. When should I request disclosures, now or after prosecutor do not agree and I have to go for trial.

If you can take pictures proving this then go to court to fight it. They will drop it provided the pictures prove the officer is in the wrong

any update on this?