Final answer:
When two cars approach each other and both signal to turn left, they should pass each other on the left before making the turn, obeying traffic signals, road markings, and right-of-way rules to carry out the maneuver safely.
Step-by-step explanation:
When two cars are driving towards each other and both turn on their left signals, indicating they are both planning to turn left, they should pass each other on the left side before making the turn.
This means that each car should move towards the center of the road (or the yellow dividing line in many countries), passing oncoming traffic on the driver's side before turning left. It's important to follow traffic signals and road markings while executing such maneuvers to ensure safety.
In the event of turning at an intersection, drivers should adhere to their respective traffic lights or yield to the right-of-way if not controlled by lights.
This can include yielding to pedestrians and any cars that are not turning. If both cars are at a stop sign or uncontrolled intersection, generally the vehicle arriving first, or to the right if they arrive simultaneously, has the right-of-way.