As mentioned earlier, road features and roadside activities are always changing. Cautionary signs are there to caution and alert you of potential danger or existence of certain hazardous conditions either on or adjacent to the roadway so that you can take the desired action for your safety.
These signs indicate a need for special caution and may require a reduction in speed or some other vehicle manoeuvre. Like mandatory signs, it is also very easy for you to identify cautionary signs.
All cautionary or warning signs are triangular with the apex pointing upward with a red border and a black symbol in the white background.
Some of the cautionary signs are Hairpin Bend, Narrow Bridge, Gap in Median, School Ahead, etc.