Of course there is one hand signal that is universal. but it is not viewed in this diagram.
It is usually used most often in heavy traffic or when interacting with caged drivers.
It is well known as the Trudeau Salute...The bird and the finger, among other names.
This signal is often used to let other motorists your feeling about their driving.
WARNING: This signal has been known to cause severe reactions in some motorists. Use at your own discretion.
