Read this article from CitizenMatters. Interesting. Notice the spec data for road works? Wonder what percent of roads in B'lore adhere to the spec!
...road should be a four layered. It should have 10 cms of metal (stones used for construction) in the bottom most layer, above it a 15 cms thick layer of wet mix (stone dust, stone crystals and cement) then 5cms of bitumen concrete and the final layer of 2.5 cms deep semi-dense asphalt, also called seal coat.