You've been using a DANGEROUS placard for a mixed load of Class 5.1 Oxidizer and Class 3 Flammable Liquid. At your next pickup, the oxidizer portion grows to 2,300 lbs loaded at that one location. What must you do?

49 CFR 172.504 (DANGEROUS placard exception and its 1,000 kg/2,205 lb limit); AAMVA CDL Manual Sec. 9.3.11 (nhcdm.pdf p.9-8)

Loads change throughout a route as pickups and drop-offs happen, and a placard that was legal that morning can become non-compliant by that afternoon. Drivers who understand the 2,205-lb trigger know to re-check their placarding, not just set it once at dispatch.