You should signal continuously while turning because it:

Question

You should always signal when turning, changing lanes, slowing down, or stopping so that other drivers, motorcyclists, bicyclists, and pedestrians will know your intentions.

Accepted Answer

Lets other drivers know what your intentions are.

Answer

Is illegal to turn off your signal before completing a turn.

Answer

Is always unsafe to turn off a signal before completing a turn.

You should signal continuously while turning because it:

Wait, before you go