MUMBAI, Nov. 18 -- Ghatkopar residents Shivani Khot, 20, and her sister, Esha, 15, have come up with a unique solution to curb air pollution and conserve fuel - a blue traffic light, which will blink 10 seconds after the red light comes on and stop blinking 10 seconds before the red light goes off. During this period, drivers will have to switch off their engine....