Assuming you mean the first Midtown Madness, you can't.
You use your arms out he widow as signals.
Use hand signals.
No, turn signals are required on the vehicle.
If you mean turn signal hand signals, then yes.
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.
If you don't have turn signal lights then you must use hand signals.
No, but you will need to use hand signals.
Required by law (motorcycles manufactured before 1973 are not required to be equipped with turn signals.)
Yes!
In GTA and in Saints Row, there are no turn signals, you just have to turn without them and hope no-one crashes into you!
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.
[left turn sig. ]right turn sig.