The Yosemite Area Regional Transportation System (YARTS) is a public transit bus line based in Merced, California providing scheduled fixed route service between Yosemite National Park and gateway communities. Service operates year-round on Highway 140, providing access to Merced and Mariposa counties. During the peak summer months, additional service is added along Highway 120 providing access to Tuolumne County, Highway 41 providing access to Fresno and Madera counties, and eastern Highway 120/US 395 providing access to Mono County.