When riding a bicycle various hand signals are used to communicate your intentions to others sharing the road with you. This can be other bike riders, but also, and more importantly, to cars and trucks.
There are all kinds of bicycle hand signals, and they may vary from location to location. For a good overview, read the discussion on this web page:
For this project, we will focus on only two hand signals - the ones used to indicate turning direction. The ones we will use are shown below.