All signals required under this chapter which may be given by hand and arm shall when so given be given from the left side of the vehicle and the following manner and interpretation thereof is suggested:
 1. Left turn – Hand and arm extended horizontally.

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Terms Used In Iowa Code 321.318

  • following: when used by way of reference to a chapter or other part of a statute mean the next preceding or next following chapter or other part. See Iowa Code 4.1
  • Vehicle: means any vehicle as defined in chapter 321. See Iowa Code 321H.2
 2. Right turn – Hand and arm extended upward.
 3. Stop or decrease of speed – Hand and arm extended downward.