What must you do before turning left at an intersection with no traffic lights?

Before turning left at an intersection with no traffic lights, yielding to oncoming traffic is paramount. This is because vehicles coming in the opposite direction may be moving toward your turning path. If you fail to yield, you could cause a collision, which could be dangerous for both you and the other drivers.

Moreover, it's crucial to ensure that there are no pedestrians or cyclists crossing at the intersection as well. They have the right-of-way, and you must wait for them to clear before proceeding with your turn. Ensuring you yield appropriately contributes to safe driving practices and prevents accidents.

While signaling your turn, coming to a complete stop, and checking your mirrors are also important aspects of safe driving, they do not take precedence over the necessity of yielding to oncoming traffic when executing a turn at an intersection.