We all have pet peeves when it comes to driving, but I think my biggest one is drivers who don't use their turn signals.

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Using a turn signal seems optional for some (maybe many) drivers but it's a required usage while driving and police can issue a ticket to someone for not using their turn signal.

Ever wonder why people don't use them? Here are seven reasons why drivers don't use their turn signals, according to studies used by The Huffington Post.