1. Colored lights placed on a vertical official traffic-control signal face shall be arranged from the top to the bottom in the following order when used:

 a. Circular red.
 b. Steady or flashing left-turn red arrow.
 c. Steady or flashing right-turn red arrow.
 d. Circular yellow.
 e. Circular green.
 f. Straight-through green arrow.
 g. Steady left-turn yellow arrow.
 h. Flashing left-turn yellow arrow.
 i. Left-turn green arrow.
 j. Steady right-turn yellow arrow.
 k. Flashing right-turn yellow arrow.
 l. Right-turn green arrow.

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Terms Used In Iowa Code 321.258

  • 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
 2. Colored lights placed on a horizontal official traffic-control signal face shall be arranged from the left to the right in the following order when used:

 a. Circular red.
 b. Steady or flashing left-turn red arrow.
 c. Steady or flashing right-turn red arrow.
 d. Circular yellow.
 e. Steady left-turn yellow arrow.
 f. Flashing left-turn yellow arrow.
 g. Left-turn green arrow.
 h. Circular green.
 i. Straight-through green arrow.
 j. Steady right-turn yellow arrow.
 k. Flashing right-turn yellow arrow.
 l. Right-turn green arrow.