045-II Wyo. Code R. § 1.3
A general road safety evaluation should be considered when determining speed limits. Such an evaluation should include the following:
(1) If there is high number of crashes on the roadway under investigation, then a detailed crash analysis should be performed to find the causes of the crashes. Once the causes are determined, then additional steps should be taken to provide safety enhancements for high crash locations. Reducing the speed limits by itself will not automatically reduce crashes.
(2) The road should be driven at a reasonable and safe speed to determine if any curves require vehicles to slow down. Further safety enhancements such as signage, delineation, shoulder widening, and guardrails should be considered at adverse curves.
(3) When horizontal curves are signed, they should include either chevrons, delineators or curve warning signs. Speed advisory signs are not required on unpaved roads.
(4) Speed limits should not be reduced due to the presence of isolated fixed objects such as utility poles, trees, rocks or narrow cattle guards. Consideration should be given to using object markers, removing the hazard or widening of the road at those locations.
(5) The speed limit should never be lowered to reduce the number of signs needed on a road.
045-II Wyo. Code R. § 1.3