The proposed measure strikes out the first sentence of section 113B of chapter 175 of the General Laws (Tercentenary Edition) as most recently amended by section 4 of chapter 459 of the acts of 1935, and inserts in place thereof a sentence which provides that the Commissioner of Insurance shall annually, on or before September fifteenth, after due hearing and investigation, fix and establish fair and reasonable classifications of risks and adequate, just, reasonable and nondiscriminatory premium charges to be used and charged by insurance companies in connection with the issue or execution of motor vehicle liability policies or bonds, as defined in section 34A of chapter 90 of the General Laws, for the ensuing calendar year or any part thereof, but said classifications and premium charges shall be uniform throughout the Commonwealth and shall not be fixed or established according to districts or zones.