Regulation 146 of the Principal Regulations is amended as follows:(a) by omitting from subregulation (1) "trailer" first occurring and substituting "light trailer" ;(b) by omitting from subregulation (2) "the trailer" and substituting "the light trailer" ;(c) by omitting from subregulation (3)(a) "the trailer" and substituting "the light trailer" ;(d) by omitting from subregulation (4) "the trailer" and substituting "the light trailer" .