The Black and Yellow Trail was the promotional name for the portion of U.S. Route 14 (US 14) nominally linking the Black Hills of South Dakota to Yellowstone National Park.[1] The signed auto trail route was extended by promoters to Chicago in the east. In 1919, it was proposed as a brand for a continuous route from Boston, Massachusetts to Seattle, Washington The headquarters for the promotional association were established in Huron, South Dakota with the aim of diverting traffic from the better-known Yellowstone Trail to the north. The Black and Yellow Trail also included portions of US 16, US 20, and US 41.[2]
The Black and Yellow Trail is notable for a 1924 speech by South Dakota state historian Doane Robinson given to the route's organizers, where he first mentioned his proposal to carve figures of historical figures at Mount Rushmore.[2]