Not only is it a great post about signaling right turns with your left arm (instead of your right), but Duncan’s post on why he signals with his left has also spurred a great little discussion in the comments about the reasons why each method can be useful:
It can be easy to forget or simply not use hand signals when cycling. Streetcar tracks, potholes, bike lanes in door zones and other obstacles can have you focusing on keeping both hands on your handlebars. Yet, when it comes to communicating with other road users there is no better way than with hand signals.
Recently, I’ve noticed a lot of debate about how to signal a right turn. In North America, both extending your left arm then angling your forearm up and simply extending your right arm to point in the direction you’re about to go are acceptable. I’ve used both styles, but my default is to use my left arm.