Pennsylvania Code
Title 67 - TRANSPORTATION
Part I - Department of Transportation
Subpart A - Vehicle Code Provisions
Article VII - Vehicle Characteristics
Chapter 171 - SCHOOL BUSES AND SCHOOL VEHICLES
Subchapter C - SCHOOL BUS BODY STANDARDS
Section 171.71 - Stirrup steps

There shall be at least one folding stirrup step or recessed foothold and suitably located handles on each side of the front of the body for easy accessibility for cleaning the windshield and lamps, except when the windshield and lamps are easily accessible from the ground. This section does not apply to vehicles not originally manufactured as school buses. A step, in lieu of the stirrup steps, is permitted in or on the front bumper for a Type D school bus.