<P> I - 29 in Kansas City has a limit of 70 mph north of Barry Road in Platte County to south of Highway 169 in Buchanan County where the limit drops to 65 mph . North of Frederick Road in Buchanan County the limit returns to 70 mph until the Iowa state line . </P> <P> As of October 1, 2015, the maximum speed limit in Montana is 80 mph . On May 5, 2015, a bill to increase Montana's rural interstate highway speed limit to 80 mph was signed into law by Governor Steve Bullock . </P> <P> In the years before the 1974 national 55 mph limit, and for three years after the 1995 repeal of the increased 65 mph limit, Montana had a non-numeric "reasonable and prudent" speed limit during the daytime on most rural roads . Montana Code Annotated (MCA) Section 61 - 8 - 303 said "A person...shall drive the vehicle...at a rate of speed no greater than is reasonable and proper under the conditions existing at the point of operation...so as not to unduly or unreasonably endanger the life, limb, property, or other rights of a person entitled to the use of the street or highway ." </P> <P> Montana law also specified a few numeric limits: a night speed limit, usually 55 or 65 mph (89--105 km / h), depending on road type; 25 mph (40 km / h) in urban districts and 35 mph (56 km / h) in construction zones . </P>

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