10 feet.
300 feet.
You should signal at least 100 feet before turning in urban areas and about 200 feet in rural areas. This gives other drivers and pedestrians enough time to react to your intention. Always ensure your turn signal is activated well in advance of the actual turn to promote safety on the road.
100 ft
You should turn on your turn signal before you need to brake for the turn.
You should signal for lane changes and turns at least 100 feet in advance in urban areas and 200 feet in advance on highways. This gives other drivers ample time to react to your intentions and ensures a safer maneuver. Always check your mirrors and blind spots before changing lanes or turning.
100ft
100 yards
Approximately 1 block away from the desired turn
In New Jersey, you should signal your intention to turn at least 100 feet before making the turn. This gives other drivers adequate notice of your actions. Additionally, it's important to use your turn signal continuously until you complete the turn to ensure clear communication with other road users.
the same as vehicles, about the length of two houses from where you are turning
You should use your turn signal in far enough advance so the car behind you knows you are going to turn and has enough time to slow down. However, putting the turn signal on too far in advance can be confusing because the following car will not know exactly when you are going to turn.
I haven't read a driver's manual for years, but yes, as far as I know drivers in Indiana are required to signal before turning.