types of roads is as they do not directly interact with the built-up environment. In the densest urban districts a statutory limit is effective when adequate signage is used, as are limits in areas of light development. The same applies to limits on highways designated as "rustic" roads. However, "an alleged failure to post [such a speed limit sign] is not a defense to a prosecution" in the case of such statutory limits. Wyoming Wyoming's highest speed limit is , found on its Interstate highways, and on its four-lane divided highways. The speed limit for school zones is , in urban districts and residential areas, 70 mph for other paved roads, and for unpaved roads. On I-80 in Cheyenne, I-25 in Cheyenne and Casper, and I-90 in Buffalo, the speed limit is . In February 2014, the state Assembly passed a bill that would raise the speed limit from on certain freeway segments that would meet safety standards. The bill passed the Senate on February 25 and raised the speed limit on certain freeway sections to 80 mph on July 1, 2014. However, an attempt to raise the speed limit to on two-lane highways such as Wyoming 120 and US 14 was turned down that same month, but this same provision became law in February 2015. On February 1, 2016, the speed limit on WY 120 (a two-lane highway) from the Chief Joseph Highway to the Montana border increased to 70 mph. Two other two-lane highway sections, WY 130 from Interstate 80 south to Saratoga and US 85 from east of I-25 to Newcastle, increased to 70 mph. See also Driver License Compact Non-Resident Violator Compact Solomon curve Traffic violations reciprocity Notes References Law review Road transportation in the United States United States United States transportation law