Yosemite National Park held a two day surprise bus inspection in the park on June 8 and 9, 2011. This was done in support of “Operation Road Check” and organized as a multi-agency task force with California Highway Patrol (CHP), San Francisco Police Department, the Federal Motor Carrier Safety Administration and the California Public Utility Commission. A total of fifty-six buses were inspected in the park on June 8 and 9. https://www.nps.gov/yose/learn/news/businspection11a.htm