US 70 is an original US Highway, signed on November 11, 1926, when the US Highway System was approved. Since then, the highway has been realigned in places. One of the larger extensions of US 70 came in 1931 when the highway was extended concurrently along NC 101 from Beaufort to Atlantic. While sections of US 70 have been converted to freeway standards, along most of the routing it is a four-lane highway. Several new projects beginning in the 2000s have placed US 70 on interstate grade freeways, such as the Clayton and Goldsboro Bypasses. On May 24, 2016, AASHTO assigned the Future I-42 designation to the majority of US 70's routing east of Garner.