Sec. 17-157. When signals required.
   (a)   A signal of intention to turn a vehicle right or left when required shall be given continuously during not less than the last one hundred (100) feet of travel by the vehicle before turning.
   (b)   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 such signal.
(Code 1982, § 23-1201)
   State law reference—Similar provisions, SDCL § 32-26-18.1.