India, Aug. 19 -- If you are someone who regularly uses the metro, you have surely spotted the yellow tiles that run throughout the platform, from the stairways at the entrance to the very end of the structures. One may naturally wonder what they are and why they are present in every single platform without fail. Here is the answer.

The yellow tiles in metro platforms are known as tactile indicators. They are life-saving tools that are meant to help people with impaired vision move safely and independently in public spaces. The tiles have raised patterns that can be felt underfoot, which can signal the visually impaired about changes in their surroundings.

Upon observation, you may notice that the tiles generally have two distinct patte...