1970s

1970
June 17 - Kansas opened its final section of I-70 at Goodland.

1971
Construction of a 2.2-mile section of the Canal Route on I-135 (then referred to as I-35W) began. Read More about the Canal Route

1974
All rural sections of Interstate in Kansas had been constructed with the opening of the last 10 miles of I-35 east of Emporia. In addition, the speed limit on all Interstate and highway routes was lowered to 55 mph due to the fuel crisis.

1975
The State Highway Commission was replaced by the Kansas Department of Transportation.

1976
September 13 - I-35W was changed to I-135.

1979
December - I-135, which connected Salina and Wichita, was completed.