A driver has a mixed load with a small amount of Division 2.3 poison gas and several Table 2 materials. Why is using only a DANGEROUS placard not enough?

1. Division 2.3 poison gas is a Table 1 any-quantity material requiring its specific placard
2. DANGEROUS placards are required for all poison gas loads
3. Poison gas is never regulated on highways
4. The driver may choose any placard if shipping papers are correct