The Lincoln Highway, the first road across America, crosses Donner Pass; this was also a part of the Victory Highway. Interstate 80 was built through this area in the early 1960s. I-80 generally parallels the route of US 40 through the Sierra Nevada, but it crosses the Sierra crest at the Euer Saddle, about north of Donner Pass. Euer Saddle is referred to by CalTrans as Donner Summit at (), located on the south side of I-80 at the Castle Peak exit beyond Boreal Inn. Donner Summit is about higher than Donner Pass, but is wider and has a gentler approach that aided construction to Interstate Highway standards, which do not allow the sharp curves used by the Donner Pass Road. The grade is 3-6% for . The 1920s highway has been preserved as a scenic alternative to I-80.