You should signal continuously while turning because it:

Lets other drivers know your intentions.
Is always unsafe to turn off a signal before completing a turn.
Is illegal to turn off your signal before completing a turn.
None of the above.
Explanation

Signaling continuously while turning is important as it lets other drivers, motorcyclists, bicyclists, and pedestrians know your intentions and gives them time to react. It also helps to keep other drivers from being surprised by your move. Always signal before you change lanes, turn left or right, slow down, or stop.

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