[Meep]

I got a ticket for failing to signal when changing lane today.
151-c is the act.

I joined a 3 - lane road in Vancouver by turning right, then I needed to make a left turn in about 3-4 blocks, 3-400m maybe? Anyways I had to quickly move 3 lanes across.

There was a police car in the left lane.
I had to get in either in front of him or behind him.

Road was busy, the Hocky game was just staring.
Nobody was driving too fast. Too crowded for that.

About 4 car lengths in front of police car which was a bit strange.
He was kind of holding back.

I wanted to get behind him but couldn't, cars right behind me, so I moved in front of him. I just didn't want to miss the turning.

He stopped me and said "I'm stopping you because you cut me off."
He said I didn't signal but I swear I did, however not for very long.

Should I dispute?

It felt like the police car deliberately held back to prevent me from moving lane safely behind him, kind of forced me to move in front of him with very short notice.
I never moved more than a lane in one go.

Does my argument sound reasonable or should I just pay?!