Regulation 20 of the Principal Regulations is amended as follows:(a) by omitting from subregulation (1) "vehicle" twice occurring and substituting "light vehicle" ;(b) by omitting from subregulation (2) "vehicle" first occurring and substituting "light vehicle" ;(c) by omitting from subregulation (2) "vehicle" second occurring and substituting "light vehicle" ;(d) by omitting from subregulation (3) "vehicle" first occurring and substituting "light vehicle" ;(e) by omitting from subregulation (3) "vehicle" second occurring and substituting "light vehicle" ;(f) by omitting from subregulation (4) "vehicle" twice occurring and substituting "light vehicle" .