Turn signals: Drivers should use them not just for other drivers, but also for pedestrians and cyclists. Knowing whether or not a vehicle will be turning can affect our safety on the streets. If you see a pedestrian, cyclist or other vehicle near enough to be affected by what you're doing at an intersection, please use turn signals if you're going to turn.
Hand signals: Do you remember learning them as part of Rules of the Road in driver ed? Do you know them? If you are a cyclist, do you use them? Communication should go both ways.
Intersection crashes and doorings cause the majority of cyclist injuries from crashes. Clear communication can prevent crashes and injuries and save lives.