More than 1,500 carmakers from 24 countries are to participate in India's bi-annual auto show, due to open this week with a focus on fuel-efficient technologies, organizers said Tuesday, according to dpa. Meanwhile, Indian manufacturer Bajaj Auto unveiled a low-cost car which is expected to compete with the Tata Nano, the world's cheapest car. The week-long Auto Expo 2012 in New Delhi, to kick off Thursday, is to see the launches of 10 new models of cars, two-wheelers and trucks as manufacturers vie for a share of the Indian market, where over 15 million vehicles are sold each year. Companies from Germany, China, France, Japan, Italy and Britain have confirmed their participation, expo chairman Rajive Kaul said. The country's main auto show expects to attract half a million visitors and boasts a display area of 115,000 square metres, he said. -- SPA