321.258 Arrangement of lights on official traffic-control signals.
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.
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.
[C79, 81, §321.258]
2014 Acts, ch 1026, §77; 2014 Acts, ch 1123, §17; 2020 Acts, ch 1063, §147, 148
Subsection 1, paragraphs b and c amended
Subsection 2, paragraphs b and c amended