Yellow tile on the footpath, why? do you know?

Most of the footpaths of Dhaka are now being redone. The yellow-red til is placed on the pavement. Ever wondered why this yellow tile is being given in the middle of the sidewalk.
Many people will say a word for beauty, not really. The pavement is visually impaired. If you notice little, this yellow tile has straight straps. A little high.A glance can easily walk straight through the legs. Once the pavement is sloping, there are six circular circles in a tile. It is easy to understand that the footpath has reduced. Along with Dhaka, the footpaths of other cities of the country are disabled people. Expect this to the public representatives. Because the visually impaired is in the country.
At least 20 percent of the total disabled people in the country are visually impaired. As such, there are at least 30 million visually impaired people in the country. But this number is not less than one and a half million as the World Health Organization. Every year, five million people are blindfolded of their blindness, want development. But if so many people forget, there is no development. Everyone will have to think. Thinking about the advantages of everyone, the development.