Turn signals are definitely preferred. Most drivers don't look for hand signals, but, they do look for turn signals. Some people don't even know how to make correct hand signals while driving.
Use hand signals.
If you mean turn signal hand signals, then yes.
No, turn signals are required on the vehicle.
No, but you will need to use hand signals.
If you don't have turn signal lights then you must use hand signals.
Required by law (motorcycles manufactured before 1973 are not required to be equipped with turn signals.)
Yes, it is legal to use hand signals when driving. In fact if your turn signal goes out you should use hand signals.
The PA Motor Vehicle Code, § 3334. Turning movements and required signals- says that you will use your turn signals or hand signals when you are turning or changing lanes.
yes
Hand signals are to this day a legal form of traffic control devices.
Your question makes absolutely no sense. However, I think you may be asking what to use if your turn signals do not work. The answer is to use hand signals.
No turn signals are not by law required, as long as you have your headlight, brake light, and you know the hand signals for turning on a bike than you don't need flashers. But if you're not using flashers, you are still required to use hand signals