Your vehicle carries 300 lbs of Class 4.1 Flammable Solid and 250 lbs of Class 5.1 Oxidizer, for 550 lbs of hazmat total, with neither material in Table 1. Are placards required?

49 CFR 172.504 (Table 2, 1,001-lb threshold); AAMVA CDL Manual Sec. 9.3.11, Fig. 9.8 (nhcdm.pdf p.9-8)

Knowing when placards are NOT required is just as testable as knowing when they are — over-placarding isn't illegal, but a driver who assumes every hazmat load must be placarded doesn't actually understand the rule, and the real test checks for that understanding directly.