The appropriate Governments and the local authorities shall, within the limits of their economic capacity and development, provide for-

1. installation of auditory signals at red lights in the public roads for the benefit of persons with visually handicap;
2. causing curb cuts and slopes to be made in pavements for the easy access of wheel chair users;
3. engraving on the surface of the zebra crossing for the blind or for persons with low vision;
4. engraving on the edge of railway platforms for the blind or for persons with low vision;
5. devising appropriate symbols of disability;
6. warning signals at appropriate places.