When two hazmat items share a vehicle, how should they be handled?

• A. They must be kept in separate vehicles.
• B. They should be loaded together without segregation.
• C. They should be segregated to prevent reaction; ensure appropriate placards are displayed for the combined load if required.
• D. They must be placed end-to-end with no separation.

Answer: (C)

When two hazmat items share a vehicle, they must be segregated to prevent any dangerous interaction if they come into contact. Segregation means using barriers, separate compartments, or maintaining a safe distance so incompatible substances cannot touch or contaminate each other during loading, transport, or unloading. This helps prevent chemical reactions, heat, fumes, or fires that could occur if the materials mix. After arranging the separation, ensure the vehicle is placarded correctly for the hazards present; if the load requires it, use placards that reflect the most hazardous class or other regulatory placarding rules for a mixed load. This approach reduces the risk of reaction and ensures responders know what materials are on board.