An Act amending Title 75 (Vehicles) of the Pennsylvania Consolidated Statutes, further defining "school bus"; and further providing for definitions, for implements of husbandry, for farm vehicles, for vehicles exempt from registration, for tire equipment and traction surfaces, for inspections, for width of vehicles, for certificate of salvage, for the transportation of school children on certain chartered buses, for use of hearing impairment devices and for the length of projecting loads.