Regulation 81 of the Principal Regulations is amended as follows:(a) by omitting from subregulation (1) "vehicle" and substituting "light vehicle" ;(b) by omitting from subregulation (2) "motor vehicle" and substituting "light motor vehicle" ;(c) by omitting from subregulation (2) "prime mover" and substituting "light prime mover" ;(d) by omitting from subregulation (3)(a) "vehicle" and substituting "light vehicle" ;(e) by omitting from subregulation (3)(b) "vehicle" first occurring and substituting "light vehicle" ;(f) by omitting from subregulation (5)(a) "vehicle" and substituting "light vehicle" .