It means that the vehicle is carrying Hydrochloric Acid.
If you mean a diamond on the lane, that means that that lane is for BICYCLISTS ONLY, if you mean as a shape of a sign such as a "slippery when wet" sign, that usually tells you important things. I looked it up in my "Virginia Driver's Manual" and it says a diamond shaped sign is a warning sign.
1789 when james madison sign the constitution so in 1789
it means that the chemical or substance is poisonous
a lemon doesent have a hazard sign because it is a natural thing
warning sign...warning you of road hazards or upcoming objects. There is diamond type symbol found on the seals found from pre-historic Harappan Civilization in South Asia. the decrypted text shows it as a sign of currency.
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I think the "Fallout Shelter" sign
bhenchod
Size of the sign
it means you need to charge it and fast or your battery will be SHOT!
Hazard close to the edge of the road. The downward lines show the side on which you may safely pass.
The hazard sign is recognisable by its shape. It will have a distinctive colour, often reflective, around its edge. These may vary by region and you can find local hazard signs in a highway code handbook.