HARRISBURG - Pennsylvania is mailing 375,000 holders of commercial driver's licenses in a recruitment campaign meant to address a shortage of school bus drivers, officials said Thursday.The state has a little more than 42,000 school bus drivers, the smallest complement in five years and about 2,000 fewer than in 2017.MORE EDUCATION HEADLINESThe Department of Transportation will mail all current CDL holders about the need for bus drivers and inform them how they can get the right endorsement to operate a school bus, said Kurt Myers, PennDOT's deputy secretary for driver and vehicle services.The state is hoping to address the shortage by appealing to drivers looking for work or seeking to supplement their income."We want to do everything we.