A student who was waiting at the stop cannot be seen or accounted for after the other students have boarded. What does the AAMVA CDL Manual direct the driver to do?

49 CFR 383.123(a)(2); AAMVA CDL Manual, Section 10.2.2 'Loading Procedures,' p. 10-4

A child small enough to be hidden in the bus's own blind spots can be seriously injured if the bus moves without the driver confirming their location. Physically checking around and underneath the bus before departing is the one step that catches this specific hazard.