Section 127(2) in The Bihar Motor Vehicles Rules, 1992
(2)Every motor cab other than those mentioned in sub-rule (1), and every maxi-cab shall be fitted with a rectangular box-like device of a size 30 cms in breadth and 10 cms in height, and made of any transparent material such device shall be fitted at the centre on roof above the front wind-shield; and the word TAXI" shall be painted, on the front and rear sides of such device, in red on a white back ground, the word "TAXI" shall be in English and the letters shall be 7 cms in height and shall have uniform thickness of 1.5 cms. The interior of such device shall be equipped with lamp of similar power as of rear lamp, illuminating the word "TAXI" so as to render it legible from a distance of 15 meters from the front and rear of the vehicles.
