A motorized rotary switch applied power alternately to the red lights mounted at the left and right of the front and rear of the bus, creating a wig-wag effect. In April of that year, rural education specialist Frank W. Depending on individual state and provincial regulations, the bus used for this purpose can either be a regular yellow school bus or a dedicated unit for this purpose. Using a chassis supplied by Spartan Motors  , Lion produces conventional-style school buses, its design features several firsts for school bus production. Larger police agencies may own police buses derived from school bus bodies for a number of purposes. Categories : Buses by type School buses Student transport. In theory, school buses affect pollution in the same manner as carpooling ; on average, each school bus transports the same number of students as 36 vehicles separately. Several configurations of entry doors are used on school buses, including center-hinged jack-knife and outward-opening. As school bus design paralleled the design of light to medium-duty commercial trucks of the time, the advent of forward-control trucks would have their own influence on school bus design.
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