A school bus driver has no working radio during an emergency and needs outside help. According to the manual, what should the driver try before considering sending students for help?

AAMVA CDL Manual, Section 10.3.2 (Evacuation Procedures), p. 10-7

Sending children for help carries real safety risk, so the manual deliberately orders the options from least to most risky. Knowing a passing motorist or resident comes before sending students keeps the driver from skipping a safer option under stress.