Dear Ravi,
You can refer Motor Vehicle Act, 1988,
Section 2 - Subsection (21) “light motor vehicle” means a transport vehicle or omnibus the gross vehicle weight of either of which or a motor car or tractor or road-roller the unladen weight of any of which, does not exceed [7500] kilograms ;
I had attached soft copy of same.
Krishan Verma
Daman