Sec. 17-143. Duty of overtaking operator.
   (a)   The operator of a vehicle on a street shall not deviate from his direct line of travel without ascertaining that such movement can be made with safety to other vehicles approaching from the rear and about to overtake and pass such first-mentioned vehicle.
   (b)   The operator of a vehicle upon a street about to be overtaken and passed by another vehicle approaching from the rear shall give way consistent with safety upon suitable and audible signal being given by the operator of the overtaking vehicle, and shall not increase the speed of his vehicle until completely passed by the overtaking vehicle.
(Code 1982, § 23-612)
   State law reference—Similar provisions, SDCL § 32-26-31.