The Prime Minister, Dr Manmohan Singh, asked major cities in the country to evolve their own technically and economically feasible solution in mass transport systems, keeping in mind their individual transport requirements. "While we need more such metros in other cities, each city must evolve its own technically and economically feasible solution. There is a wide spectrum of other proven transport technologies successfully operating in other parts of the world. The choice of technology has to be city-specific," Dr Singh said inaugurating the 22.79-km-long Barakhamba Road-Dwarka section of Delhi Metro.