I've used my right hand to signal a right turn for a long time.

Just out of curiosity, I went and checked the vehicle code for Massachusetts (which is where I live and also where I ride a good chunk of the time).

From Chapter 85, Section 11B. Bicycles; operation and equipment; regulations; "(2) the bicycle operator shall signal by either hand his intention to stop or turn,". So I guess here signalling with the right hand is legal for those of us who choose to use it.

I also think that it is clearer to others on the road when we point (signal) to show the direction we will be turning.

--- Denise