Iowa Code

Iowa Code § 321.237 (2026)

Signs — requirement — notice

✓ current as of July 2026

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1. A traffic ordinance or regulation enacted under section 321.236, subsection 4, 5, 6, 8, 12, or 13, shall not be effective until signs, giving notice of such local traffic regulations as specified in the department manual on uniform traffic-control devices, are posted upon or at the entrances to the highway or part thereof affected as may be most appropriate and shall be erected at the expense of the local authority.

2. When a city has adopted an ordinance as authorized in section 321.236, subsection 12, or an ordinance which prohibits standing or parking of vehicles upon a street or streets during any time when snow-removal operations are in progress and before such operations have resulted in the removal or clearance of snow from such street or streets, signs as specified in the department manual on uniform traffic-control devices, posted as provided in subsection 1, shall be deemed sufficient notice of the existence of such restrictions. [C39, §5018.02; C46, 50, 54, 58, 62, 66, 71, 73, 75, 77, 79, 81, §321.237] 86 Acts, ch 1056, §3; 2018 Acts, ch 1026, §111 Referred to in §331.362 \n

Notes of Decisions

Cited in 3 cases, 1969–2020 · leading case: State Of Iowa Vs. Donna Kay Louwrens, 792 N.W.2d 649 (Iowa 2010).

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State Of Iowa Vs. Donna Kay Louwrens, 792 N.W.2d 649 (Iowa 2010). · cites it 8× “The parties stipulated that although an Estherville ordinance prohibits U-turns anywhere on Central Avenue, state law, specifically Iowa Code section 321.237 (2007), dictates that such turning restrictions are not effective until signs are posted in the restricted areas.”

Lemke v. Mueller, 166 N.W.2d 860 (Iowa 1969). · cites it 4× “Designating any highway as a through highway and requiring that all vehicles stop or yield the right-of-way before entering or crossing the same or designating any intersection as a stop intersection and requiring all vehicles to stop at one or more entrances to such…”

State of Iowa v. Grason Trever Lansman (Iowa Ct. App. 2020). · cites it 2× “But they did not understand Iowa Code section 321.237 dictated such turning restrictions were not effective without posted signs.”

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