You should use turn signals to indicate your intention with sufficient time to allow other drivers to see the signal:

If it’s raining.
BEFORE you move.
AFTER you move.
Even if they are short sighted.
Explanation

Before you make a turn, use your turn signal to give the other drivers enough time to react and see the signal before you move. Making last-minute decisions and turning without warning could lead to a rear-end collision.

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