1.  A driver shall not turn a vehicle from a direct course upon a highway unless and until such movement can be made with reasonable safety, and then only after giving a clearly audible signal by sounding the horn if any pedestrian may be affected by such movement and after giving an appropriate signal if any other vehicle may be affected by such movement.

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2.  A signal of intention to turn right or left, or otherwise turn a vehicle from a direct course, shall be given continuously during not less than the last 100 feet traveled in a business or residential district and not less than the last 300 feet traveled in any other area prior to changing the course of a vehicle. This rule shall be observed, regardless of the weather.

3.  A driver shall not stop or suddenly decrease the speed of a vehicle without first giving an appropriate signal to the driver of any vehicle immediately to the rear.