Regulation 61 of the Principal Regulations is amended as follows:(a) by omitting paragraph (c) from subregulation (1) and substituting the following paragraph:(c) is not fitted with rear marking plates, or conspicuity markings, in accordance with regulation 108 .(b) by omitting subregulation (2) and substituting the following subregulation:(2) For subregulation (1)(a), the width of a vehicle does not include the following devices or systems:(a) anti-skid devices mounted on wheels;(b) central tyre inflation systems;(c) lights, mirrors and reflectors;(d) signalling devices;(e) tyre pressure gauges;(f) permanently affixed webbing assembly-type devices if the width of the vehicle including those devices does not exceed 2.55 metres.