Iowa Code § 321.258
Arrangement of lights on official traffic-control signals
Redline — January 1, 2012 → current.View current text →
Current — January 1, 2022
As of January 1, 2012
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: Circular red, circular yellow, circular green, straight through yellow arrow, straight through green arrow, left turn yellow arrow, left turn green arrow, right turn yellow arrow, and right turn green arrow.
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: Circular red, circular yellow, left turn yellow arrow, left turn green arrow, circular green, straight through yellow arrow, straight through green arrow, right turn yellow arrow, and 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.
Official source: Iowa Legislature. Reproduced from public-domain Iowa statutes; confirm against the official source for the current text. Not legal advice.