Oregon Route 58 is of high importance as a freight corridor. It is the primary route between the Willamette Valley and south-central Oregon, including the Klamath Falls region. It also is the preferred route to points further southeast, including Reno, Nevada. Finally, it is an important alternate route for traffic moving up and down the West Coast, as bad weather frequently closes Interstate 5 at the Siskiyou Summit during the winter. The Union Pacific Railroad I-5 Corridor main line through Oregon and California roughly follows OR 58 and US 97. While a rail line exists through Siskiyou Summit, it is difficult for trains to use even in good weather, due to an excessively steep grade, and is often uneconomical to use in winter weather. It is common for West Coast truck traffic to prefer OR 58 and US 97 to Interstate 5 for the same reason.