Transport authorities have booked as many as 39 cases against private school buses and 61 cases against other buses since the launch of a special drive from November 1 across the district, said Deputy Transport Commissioner G.C. Rajaratnam. In the drive undertaken afresh in Armoor, Bodhan, Banswada and Kamareddy on Wednesday, 15 cases were registered against private school buses and one travel bus was seized, he said adding the drive would continue for a few more days.