sentences:  Current US 50 Alternate came into existence around the time of Nevada's state highway renumbering in 1976.While the new number was posted along the road circa 1977 and first seen on Nevada's state highway map in the 1978 edition, the designation had yet to be formally approved.The American Association of State Highway and Transportation Officials (AASHTO, which governs the assignment of U.S. Highway numbers) finally approved the routing at a highway numbering committee meeting held on April 25, 1997, nearly 20 years after US 50A was first signed.