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A turn signal light bulb is a type of bulb that is used for turn signal lights. It alerts other drivers and pedestrians that the vehicle is making a turn. It signals from behind to slow down or take the lane opposite to where the vehicle is turning. As for vehicles in front, a turn signal light signals them to slow down as the vehicle makes the turn, crossing the lane of the oncoming traffic. It also compliments to the overall look of the car, truck, or SUV. A faulty turn signal light bulb may cause accidents when a vehicle is changing lanes or directions especially during high speed driving. Auto Parts Network provides high quality parts at very low cost.