And some similar info for Wyoming:
31‑5‑301. Maximum speed limits.(a) No person shall drive a vehicle on a highway at a speed greater than is reasonable and prudent under the conditions and having regard to the actual and potential hazards then existing. Consistent with the foregoing, every person shall drive at a safe and appropriate speed when approaching and crossing an intersection or railroad grade crossing, when approaching and going around a curve, when approaching a hillcrest, when traveling upon any narrow or winding roadway and when special hazards exist with respect to pedestrians or other traffic or by reason of weather or highway conditions.
( B) Except when a special hazard exists that requires lower speed for compliance with subsection (a) of this section, the limits specified in this subsection or established as otherwise authorized shall be maximum lawful speeds and no person shall drive a vehicle on a highway at a speed in excess of maximum limits:
(i) Twenty (20) miles per hour when passing a school building, or the grounds thereof, or a school crossing if appropriate signs giving notice of that limit are erected;
(ii) Thirty (30) miles per hour in any urban district;
(iii) Seventy‑five (75) miles per hour on interstate highways. Nothing in this paragraph shall be construed to:
(A) Affect the authority of the superintendent to otherwise designate lower maximum speed limits on interstate highways except as provided for in W.S. 31‑5‑303( B) in accordance with other laws; or
( B) Authorize noncompliance with posted speed limits on interstate highways.
(iv) Sixty‑five (65) miles per hour in other locations;
(v) Repealed By Laws 1997, ch. 61, § 2.
© The maximum speed limits set forth in this section may be altered as authorized in W.S. 31‑5‑302 and 31‑5‑303.
(d) Speeding violations of up to eighty (80) miles per hour where the posted speed limit is at least sixty-five (65) miles per hour, or less than six (6) miles per hour over the posted speed limit in all other instances and zones, except violations for exceeding the speed limit in a school zone, or construction zone, and violations received while operating a commercial motor vehicle as defined by W.S. 31‑7‑102(a)(viii), shall not be made a part of the abstracts or records kept by the department of transportation pursuant to W.S. 31‑5‑1214 or 31‑7‑120.
Date: 01/11/2016
The speed limit will increase to 70 mph on sections of US 85, WYO 130 and WYO 120 later this month, when weather permits WYDOT to change the speed limit signs on the highways.
Much of US 85 from just east of its interchange with I-25 (Exit 17) north of Cheyenne to Newcastle will be posted with the 70 mph limit. Highway segments adjacent to communities will retain their current speed limit. WYO 130 from I-80 south to Saratoga, and WYO 120 from about 18 miles north of Cody to the Montana border also will get the higher limit.
CHEYENNE — Wyoming drivers can now legally exceed the speed limit to pass slow vehicles under certain conditions.
The new rule is among several state laws that went into effect Sunday, which was the start of the 2013 fiscal year.
The exceeding-while-passing bill was one of the more popular pieces of legislation that came out of the 2012 legislative session.
The bill unanimously passed the state Senate and received just two “no” votes in the House of Representatives.
The measure allows motorists to exceed the speed limit by up to 10 mph on two-lane highways if the vehicle they are passing is traveling slower than the speed limit.
Rep. Del McOmie, R-Lander, who sponsored the bill, said earlier in the year that many Wyoming drivers didn’t even know they were breaking the law when they topped the speed limit while passing a vehicle.
He added that it is often safer to speed up when passing to avoid a potential head-on collision.
“(Law enforcement) recognizes this safety situation too,” he said. “My concern is that if this already is the practice (for law enforcement to not strictly enforce the previous restriction), why don’t we put it into law?”
The law passed despite some protest from the Wyoming Highway Patrol and the Wyoming Peace Officers Association. They said there could be some safety hazards if motorists misinterpret the new law.
In a news release earlier this week, Wyoming Highway Patrol Administrator Col. John Butler noted there are some restrictions that need to be followed, including:
-Motorists would only be able to pass one vehicle at a time.
-Motorists can’t pass if the other vehicle is driving at or above the speed limit.
-It applies only to two-lane highways with a posted speed limit of 50 mph or faster.
“The big factor here is safety,” Butler said. “Just because we have a law in place now that allows you to exceed the speed limit to pass a vehicle not traveling at the speed limit, it does not mean that you can just go out and do so without due regard for the safety of the roadway.
“It’s even more critical now that you really pay attention to what’s going on.”
https://www.yourmechanic.com/article/wyoming-speed-limits-laws-and-fines-by-valerie-mellema
Wyoming has a driver’s license compact with 44 other states (the exceptions are Wisconsin, Tennessee, Michigan, Massachusetts and Georgia). The agreement calls for states to notify one another when law enforcement tickets a driver.