In addition, the lower Kern, South Fork Kern and Canebrake Creek valleys provide an important transportation route. California State Route 178 runs through them, linking Bakersfield and Inyokern, which lie on opposite sides of the Sierra, via Walker Pass. SR178 is one of the few routes that cross this section of the mountain range. The road was first built in the 1890s. It was added to the California state highway system in 1919, and was paved in 1940.