Final answer:
In road safety, a left turn is indicated by a straight left arm, a right turn by a left arm with a raised hand at the right angle, and slowing or stopping by a downturned left arm at the right angle.
Step-by-step explanation:
The arm signals for turning and stopping while driving are important for communicating with other road users when turn signals are not working or when riding bicycles. For a left turn, you should extend your left arm straight out to the side. For a right turn, you should extend your left arm out, bending at the elbow so your hand points upwards at a right angle. To indicate you plan to slow down or stop, extend your left arm out with the elbow bent downwards at a right-angle, hand pointing to the ground.