There is a spot on my morning commute where I need to turn right. If there is no traffic behind me, I'll ride in the center of the lane. This is the case maybe 50% of the time.

If there is traffic behind me I'll ride further to the right. Problem is the pavement is akin to a washboard. I wouldn't dare take a hand off of the handle bars to signal my right turn. Sometimes you can, sometimes you can't.

That said, no one has ever yelled at me for not signaling at this intersection.