You should signal continuously while turning because it:

Lets other drivers know what your intentions are.
Is always unsafe to turn off a signal before completing a turn.
Is illegal to turn off your signal before completing a turn.
Helps save fuel.
Explanation

Signaling lets other drivers of your intentions, allowing them to anticipate your actions and react accordingly. Get into the habit of signaling every time you change direction, even when you do not see anyone else around.

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