Iowa Code 321.258 – Arrangement of lights on official traffic-control signals
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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.
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.