Approximately 1 block away from the desired turn
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.
200 feet before the turn according the the IL driving school test answer (1 city block)
10 feet.
500 feet
Motor vehicle laws differ from state to state. Some states do not have a law informing drivers as to how far in advance their turn signals need to be activated. A good rule of thumb is to signal in no less than 100 feet before your turn. This is also a courtesy to other drivers, so they are aware of your next move.
100 yards
300 feet.
the same as vehicles, about the length of two houses from where you are turning
It does have a bearing. The rule in most states is 100 feet. But I recommend you use them at 200 feet if you are traveling at over 50 mph.
100 ft.
As far in advance as possible with respect to the photographer and his or her personal wishes on how far in advance they would like to be notified.