Service de transport de Wellington-Dufferin Student Transportation Services (STWDSTS) is a consortium of five school boards providing transportation for eligible students living in Wellington and Dufferin Counties. It is our mission to provide safe, efficient student transportation through planning, cooperation and dedication. More than 20,000 students in total ride a big - or little - yellow school bus or taxi to and from school daily. The fleet of buses covers more that 5 million kilometers every year.