The ruling on greeting with a gesture without saying the salam

Question:
He says: Honorable Shaykh, may Allah grant you success. Sometimes when I am driving in my car and I see a person I want to greet, I say the salam while raising my left hand. Is there any sin on me for raising it?

Answer:
One does not greet with a gesture unless the person being greeted is far away. So you gesture so that he realizes you are greeting him, and you are content with the gesture. You say, "As-salamu alaykum," but he does not hear you, so you raise your hand so that he realizes it and returns the greeting. But if he is close, do not greet with a gesture, and do not raise your hand to him; greet him with words, and he returns the greeting with words. As for the fact that you cannot raise your right hand, meaning you are driving the car, there is no harm in raising your left hand. Yes.