Why is the head light always on in BS_IV vehicles?
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Recently Supreme Court has given a ruling that 1 April onward only BS-IV vehicles can be sold and registered in India. BS-IV vehicle's head light is always on even during day time. There is no switch to put off the light off. This will cause the filament life to be shortened and unnecessary energy loss. I want to know why the government and auto dealers has designed BS-IV so?