 The name "mousetrap" was coined by the long-time airborne radio traffic reporter Don Martin in the 1960s, calling the interchange "a maze that could trap a mouse".In the original design, interchange ramps included sharp curves, some of which were left exits instead of right exits.When construction began on Interstate 70, the alignment of 46th Avenue was used for the freeway, while Interstate 25 was built directly over top of the alignment of US 87.