A bus driver is only going three blocks to the next stop and decides not to buckle their seat belt. Is this acceptable under CDL safety guidance?

AAMVA CDL Manual, Section 4.1.5, p. 4-1

Many crashes happen close to home or on short, familiar routes where drivers let their guard down. Treating the seat belt as optional on a 'quick' trip removes the one piece of equipment that protects the driver during a sudden stop or collision.