Omnitrans is the largest bus agency in San Bernardino County, while the Riverside Transit Agency (RTA) is the largest in Riverside County. Currently, some of Omnitrans' bus routes run on headways of an hour or more, and some routes stop service in the early evening or may not run on weekends. SunLine Transit Agency provides bus service in the Coachella Valley while the Victor Valley Transit Authority (VVTA) provides transit service in the High Desert, including to Barstow after the transit systems in the latter was merged into VVTA in 2015. Other operators in the region include Pass Transit serving the Banning Pass area, Needles Area Transit serving the city of Needles, Mountain Transit serving the communities in the San Bernardino Mountains including Lake Arrowhead, Big Bear, Running Springs, and Crestline, and the MBTA serving the Morongo Basin and Yucca Valley portions of San Bernardino County.