The correct answer is "Triangular signboards."
Warning road signs are typically triangular in shape with a red border. They are used to alert drivers of potential hazards ahead, such as sharp bends, pedestrian crossings, or animal crossings.
- Circular signboards are usually used for regulatory signs, such as speed limits and no-entry signs.
- Rectangular signboards are generally used for informational signs, like road directions and place names.
- Square signboards are less common but are sometimes used for special information signs.
Therefore, warning road signs are indicated on triangular signboards.
The correct answer is "Triangular signboards."
Warning road signs are typically triangular in shape with a red border. They are used to alert drivers of potential hazards ahead, such as sharp bends, pedestrian crossings, or animal crossings.
- Circular signboards are usually used for regulatory signs, such as speed limits and no-entry signs.
- Rectangular signboards are generally used for informational signs, like road directions and place names.
- Square signboards are less common but are sometimes used for special information signs.
Therefore, warning road signs are indicated on triangular signboards.