VIOLATION OF LAW AS NEGLIGENCE PER SE; JURY ISSUE AS TO EXCUSE OR JUSTIFICATION
There was in force at the time of the occurrence in question [a law] [laws] which read as follows:
An unexcused violation of the law[s] just read to you constitutes negligence as a matter of law. If you find that a party, without excuse or justification, violated a law just read to you, it is your duty to find such violation to be negligence; and you should then consider the issue of whether that negligence was a [proximate] [legal] cause of injury or damage to the plaintiff.
The burden of proof is upon the person who violated the law to show by a preponderance of the evidence that such violation was excusable or justifiable. A violation of law is excusable or justifiable only if you find that the person who violated the law did what might reasonably be expected of a person of ordinary prudence, acting under similar circumstances, who desired to comply with the law.
NEV. J.I. 4.13