India, June 18 -- Lutyens' Delhi is set to change colour ; all road signs in the 42.7 sq km part of the Capital that houses offices and residences of top functionaries and officials of the executive, legislature and judiciary are to now have a blue background, with white lettering, in keeping with norms laid down by the Indian Roads Congress, according to people familiar with the matter.

According to the guidelines issued by the national body which prescribes design standards for roads, green signboards of the sort currently found in the area, which is under the New Delhi Municipal Corporation (NDMC), are to be used only on state and national highways. The signboards in the NDMC area are green, with names written in white in English, Hin...