Chapter 6.5. Motor Carrier Safety * Article 8. General Equipment Requirements Drive Shaft Protection.
A drive shaft guard to prevent broken shafts from whipping through the floor or dropping to the ground shall be required on:
(a) School Buses--On all Type 1 school buses constructed after January 1, 1950, and all Type 2 school buses constructed on or after July 1, 1970, each segment of the drive shaft shall be equipped with a guard.
(b) Other Vehicles--All Type 1 buses and all farm labor vehicles designed for more than 16 passengers and the driver shall be equipped with at least one guard or bracket if the drive shaft extends under the passenger compartment.