It is found in VERY few areas and it means a change in the road from a 4 lane to a 2 lane road.
Warning
bhenchod
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.
In the U.S. a yellow diamond shape sign with a black S shape with an arrow.
Usually are yellow and diamond-shaped, with black lettering or symbols.
Usually it is posted on a yellow diamond shaped warning sign.
That would be a double curve, it would be a black "S" on a yellow diamond shaped sign.
A yellow diamond-shaped sign with a black number inside indicates the highest safe speed limit in that area.
Most often these signs are in mountainous areas theres one sign for steep inclines the other is for steep declines the inclines would be shown by a steep line such as / with a truck on it while the opposite for declines \ also with a truck on it.
That would be a diamond yellow sign with an "s" shaped arrow in the direction of the turns (in the U.S.)
A sign that you will never get laid.
The Codiac sign is a roadway sign that warns drivers of a blind intersection ahead. It is typically a yellow diamond-shaped sign with a black symbol depicting a "C" shape, which signifies the possibility of a blind corner or hidden intersection requiring caution.
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.