^ thats coz of the 75% withholding tax, imagine a 1000cc car used to have a road tax of 500 (6monthly making it Rs 1000 yearly)
750 is the additional tax without any reason, that makes a total of rs.1750, they should keep it minimal so that every body pays it, but in the end every one is forced to pay the tax or else when you sell your car u have to pay it.