100 feet or 4 seconds ferore the turn but when it's like raining or anything like that 200 feet. It gives people behind time to think if their paying attention.
To maximise safety, it is best to signal for at least three seconds before you make a turn (this is a legal requirement on New Zealand roads).
In the UK there is no specific distance. The signal should be clear and unambiguous and suit local conditions.
100
Answer 100 feet
100 ft ahead
in Florida it is 100 feet
in florida it is 100 feet
About 100 feet.
At least 100 feet.
At least 500 feet.
100 feet
100 feet
100 feet.
300
500 feet