However, on some buses such as Gillig's Transit Coach models and the Kenworth-Pacific School Coach activation of the roof warning lamp system was through the use of a pressure-sensitive switch on a manually controlled stop paddle lever located to the left of the driver's seat below the window. Several configurations of entry doors are used on school buses, including center-hinged jack-knife and outward-opening. For the purposes of evacuation, school buses are equipped with a minimum of at least one emergency exit in addition to the main entry door. While CDLs were issued by individual states, the federal CDL requirement ensured that drivers of all large vehicles such as school buses had a consistent training level. During the s and s, manufacturers also began to develop designs for small school buses, optimized for urban routes with crowded, narrow streets along with rural routes too isolated for a full-size bus. As vehicles evolved from horse-drawn to "horseless" propulsion on a wider basis, the wagon bodies of kid hacks and school cars were adapted to truck frames. Officially, school bus yellow was designated "National School Bus Chrome"; following the removal of lead from the pigment, it was renamed " National School Bus Glossy Yellow ". In place of the metal-back passenger seats seen since the s, the regulations introduced taller seats with thick padding on both the front and back, acting as a protective barrier.
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