While approaching and stopping at a railroad crossing, where should the school bus driver position the vehicle, if possible?

AAMVA CDL Manual Section 10.4.3, p. 10-9; 49 CFR 383.123(a)(2)(iii) (general knowledge-test topic only); 49 CFR Part 380, Appendix D, Unit D1.6 (Railroad-Highway Grade Crossings)

Positioning to the right while slowing and stopping leaves room for other traffic to see and react to the bus, and keeps the bus in a predictable, recommended position during one of the highest-risk maneuvers a school bus driver performs.