Representational Picture

Seldom do motorists switch off their engines at signals, leading to fuel wastage and a rise in air pollution in and around the busy traffic junctions. In order to address this peculiar problem, 19-year-old Shivani Khot and her younger sister Esha (14) have come up with a unique solution - adding a new "blue" signal along with the red, yellow and green ones that people are familiar with. As per their novel initiative, all the engines have to be compulsorily switched off at the blue signal.