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331.14 SIGNALS BEFORE CHANGING COURSE, TURNING OR STOPPING.
(a) No person shall turn a vehicle or move right or left upon a highway unless and until such person has exercised due care to ascertain that the movement can be made with reasonable safety nor without giving an appropriate signal in the manner hereinafter provided.
When required, a signal of intention to turn or move right or left shall be given continuously during not less than the last 100 feet traveled by the vehicle before turning, except that in the case of a person operating a bicycle or electric bicycle, the signal shall be made not less than one time but is not required to be continuous. A bicycle or electric bicycle operator is not required to make a signal if the bicycle or electric bicycle is in a designated turn lane, and a signal shall not be given when the operator's hands are needed for the safe operation of the bicycle or electric bicycle.
No person shall stop or suddenly decrease the speed of a vehicle without first giving an appropriate signal in the manner provided herein to the driver of any vehicle immediately to the rear when there is opportunity to give a signal.
Any stop or turn signal required by this section shall be given either by means of the hand and arm, or by signal lights that clearly indicate to both approaching and following traffic intention to turn or move right or left, except that any motor vehicle in use on a highway shall be equipped with, and the required signal shall be given by, signal lights when the distance from the center of the top of the steering post to the left outside limit of the body, cab or load of such motor vehicle exceeds twenty-four inches, or when the distance from the center of the top of the steering post to the rear limit of the body or load thereof exceeds fourteen feet, whether a single vehicle or a combination of vehicles.
The signal lights required by this section shall not be flashed on one side only on a disabled vehicle, flashed as a courtesy or "do pass" signal to operators of other vehicles approaching from the rear, nor be flashed on one side only of a parked vehicle except as may be necessary for compliance with this section.
(b) Except as otherwise provided in this subsection, whoever violates this section is guilty of a minor misdemeanor. If, within one year of the offense, the offender previously has been convicted of or pleaded guilty to one predicate motor vehicle or traffic offense, whoever violates this section is guilty of a misdemeanor of the fourth degree. If, within one year of the offense, the offender previously has been convicted of two or more predicate motor vehicle or traffic offenses, whoever violates this section is guilty of a misdemeanor of the third degree.
If the offender commits the offense while distracted and the distracting activity is a contributing factor to the commission of the offense, the offender is subject to the additional fine established under Section 303.991 of the Traffic Code.