Iowa Code
Iowa Code § 321.316 (2026)
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A person shall not stop or suddenly decrease the speed of a vehicle without first giving an appropriate signal in the manner provided in sections 321.314, 321.315, 321.317, and 321.318 to the driver of any vehicle immediately to the rear when there is opportunity to give such signal. [S13, §1571-m18; C24, 27, 31, 35, §5032; C39, §5025.06; C46, 50, 54, 58, 62, 66, 71, 73, 75, 77, 79, 81, §321.316] 2021 Acts, ch 80, §172 Referred to in §321.314, 805.8A(6)(p) For applicable scheduled fine, see §805.8A, subsection 6
\nNotes of Decisions
Cited in 11
cases, 1950–1993 · leading case: Jesse v. Wemer & Wemer Co., 82 N.W.2d 82 (Iowa 1957).
Jesse v. Wemer & Wemer Co., 82 N.W.2d 82 (Iowa 1957). “Section 321.316, Code of 1954, I.C.A., in contemplation of required and necessary stops on the highway, sets out a requirement of notice to following vehicle operators.”
Mongar Ex Rel. Mongar v. Barnard, 82 N.W.2d 765 (Iowa 1957). “These are, in effect, the two charges of negligence submitted to the jury.”
Nichols v. Schweitzer, 472 N.W.2d 266 (Iowa 1991). “This instruction tracks section 321.316 of our Code. Generally, Iowa law requires that a court give a requested instruction when it states a correct rule of law having application to the facts of the case and the concept is not otherwise embodied in the other instructions.”
Lovely v. Ewing, 183 N.W.2d 682 (Iowa 1971). “Paul Lindquist, plaintiff’s expert medical witness; (3) Error in refusing to give defendant’s requested instruction on plaintiff’s duty to give a signal under section 321.316, The Code, 1966; and (4) Error in submitting the issue of defendant’s speed to the jury.”
Cavanaugh v. Jepson, 167 N.W.2d 616 (Iowa 1969). “At the conclusion of the evidence, the court submitted two specifications upon which the jury might find plaintiff negligent.”
Baker v. Wolfe, 164 N.W.2d 835 (Iowa 1969). “” Section 321.316, Code of Iowa, 1966 requires a signal of intention to stop or suddenly decrease speed “when there is opportunity to give such signal.”
Harris v. Clark, 103 N.W.2d 215 (Iowa 1960). “There is no evidence of an emergency for defendant until that point, nor is there any conclusive evidence that defendant’s speed, lookout, control or following too closely were negligent before plaintiff put on his brake lights.”
Stam v. Cannon, 176 N.W.2d 794 (Iowa 1970). “A duty to signal is prescribed by Code, 1966, section 321.316. The trial court evidently believed Stam had not shown a violation of that duty.”
Weber v. Hansen, 43 N.W.2d 766 (Iowa 1950). “A signal of intention to turn right or left is required to be given continuously during not less than the last one hundred feet traveled before turning. Section 321.”
Cunningham v. Court, 82 N.W.2d 292 (Iowa 1957). “Plaintiff contends the statement by defendant that he did not see or observe any signal given by plaintiff as a warning that he was slowing down or intended to make a left turn was not sufficient evidence to raise the issue as to whether plaintiff did give such appropriate,…”
Pratt v. Piper, 500 N.W.2d 716 (Iowa Ct. App. 1993). “See Iowa Code § 321.316 (1991). Even accepting the jury’s finding that this accident was proximately caused in part by the plaintiff’s “stutter stop,” we conclude sufficient evidence exists in the record to support the trial court’s decision that the jury’s verdict did not…”
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