100 ft for every 10 mph.
15 metres
100ft or 30m
Generally you have your wheels turned enough to begin making the turn, and your indicator should be flashing for a minimum amount of time before turning. Hence, you both turn and signal while waiting.
You should turn on your turn signal before you need to brake for the turn.
The legal distance varies by state, but in city traffic, 100 feet should be pretty safe. Allow more distance on the highway
500 ft
Your turn signal should be activated one block from the intersection you are going to turn into.
200 feet = 1 city block according to new jersey driver's manual
100 feet minimum.
turn your turn signal on
500 feet
On a busy street, at least a block or so before the turn. On a less busy street, not a block perhaps but certainly some distance before the turn.