Originally Posted by
ThermionicScott
You'd be free to use whichever arm is more convenient -- I use whichever one needs a break from holding onto the handlebars. Unless you're riding no-hands, priority would go to signalling, of course.

So... you believe the average motorist isn't smart enough to know the laws and proper way to signal or interpret a legal signal. BUT... you you think the average person has great enough psychic powers to know when a cyclist is resting an arm, waving, or signaling. I just don't think people are as psychic as you believe they are.
But... then again... if YOU'RE really, really psychic... you'd know better.