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 D - ADDITIONAL STANDARDS FOR SPECIALLY EQUIPPED SCHOOL BUSES AND SCHOOL VEHICLES
Section 171.92 - Aisles

(a) School buses equipped with a power lift or a ramp shall have aisles a minimum of 30 inches wide leading from the wheelchair or other type of mobility device area to the emergency door, power lift or ramp special service entrance. Under § 171.42 (relating to aisle), school buses that are not equipped with a power lift or ramp shall have aisles with a minimum clearance of at least 30 centimeters-11 3/4 inches-wide leading to the emergency door and the service entrance door.

(b) School vehicles may not be equipped with more than two wheelchair positions. (Each wheelchair seating position is counted as four designated seating positions, under 49 CFR 571.3(b) (relating to definitions).