When I was relatively new to police work I was patrolling behind a car that had stopped at a red light with the left turn signal blinking. The next thing I knew, this car had turned left against the red light! Well, on went the lights and siren and I chased down this alleged red light runner. This would be an easy ticket, or so I thought.
"What do you mean officer?" asked the driver. "I'm allowed to turn left on a red light if I turn onto a one way street!"
I collected his documents and went back to the police car. Out came my copy of the Motor Vehicle Act and I read the section on red lights carefully. This driver was absolutely correct! I gave his documents back and apologized with a face that was likely just as red as that traffic light had been.
My lesson for the day was that in British Columbia, if I was turning left in the proper direction onto a one way street, I could do so after I had stopped at the red light and yielded to traffic as necessary. However, this type of turn may be prohibited by a sign at the intersection and may be prohibited entirely in other jurisdictions.
A great travel reference is the Digest of Motor Laws published by the Canadian Automobile Association. You can pick one up at your local BCAA office and check situations like this one before you travel.