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Question:

A(n) __________ sign on a truck means that the truck's load is potentially dangerous.

A diamond-shaped
Explaination

A diamond-shaped sign on a truck means that the truck's load is potentially dangerous (gas, explosives, etc.). California Highway Patrol (CHP) or fire department officers know what to do if the load is accidentally spilled. [Vehicles with Hazardous Loads; Sharing the Road; California Driver Handbook]