1. The petitioners operate a public service vehicle and have a stage carriage permit. The permits were granted on different dates and were valid for a period of five years. In other words, the permits were valid for periods upto 2009, 2010, 2011. The petitioners were plying their vehicles on the strength of said stage carriage permits granted under the provisions of the Motor Vehicles Act, 1988. A decision was taken by South Bihar Regional Transport Authority constituted under the said Act after the permits were granted to the petitioners restricting the life of motor vehicles under the permits to fifteen years. In other words, the decision was that the vehicle owners, who were operating vehicles which had crossed the age of fifteen years since original registration, they were required to replace the vehicles under those permits by newer vehicles. Effectively on petitioners not replacing their old vehicle with newer vehicle, the petitioners permits were cancelled. This brought the petitioners to this Court. Shri Badri Narayan Singh, learned Counsel appearing in support of the writ petition submits that if no stage carriage permit is issued to motor vehicle which is stage c