In North America, school buses are purpose-built vehicles distinguished from other types of buses by design characteristics mandated by federal and state regulations. In addition to their distinct paint color (school bus yellow), school buses are fitted with exterior warning lights (to give them traffic priority) and multiple safety devices. . mw-parser-output . toclimit-2 . toclevel-1 ul,. mw-parser-output . toclimit-3 . toclevel-2 ul,. mw-parser-output . toclimit-4 . toclevel-3 ul,. mw-parser-output . toclimit-5 . toclevel-4 ul,. mw-parser-output . toclimit-6 . toclevel-5 ul,. mw-parser-output . toclimit-7 . toclevel-6 ul{display:none}