Section 123(6) in The Bihar Motor Vehicles Rules, 1992
(6)The weight in kilograms of goods carried on a stage carriage shall not exceed (N-X) x 68 where in relation to a single decked stage carriage or to the lower deck of a double decked stage carriage. N is the registered passenger seating capacity of the vehicle, and X is the number of passengers carried on the vehicle or the number of passengers for whom seats are kept free and unimpeded by goods, whichever is greater.