ROAD TRAFFIC Citation and commencement 1 These Regulations may be cited as the Road Vehicles (Construction and Use) (Amendment) (No. 1) Regulations 1991 and shall come into force on 1st November 1991. Preliminary 2 1 The Road Vehicles (Construction and Use) Regulations 1986 shall be further amended in accordance with the provisions of these Regulations. 2 The Secretary of State is satisfied that— a it is requisite that the provisions of regulations 3, 4 and 5 shall apply as from 1st November 1991 to vehicles registered under the Vehicles (Excise) Act 1971 before the expiration of one year from the making of these Regulations; and b notwithstanding that the said provisions will then apply to those vehicles, no undue hardship or inconvenience will be caused thereby. Amendments to provisions concerning composite trailers 3 For the definition of “converter dolly” in the Table in regulation 3(2) there shall be substituted— a a trailer which is— i equipped with 2 or more wheels, ii designed to be used in combination with a semi-trailer without any part of the weight of the semi-trailer being borne by the drawing vehicle, and iii not itself a part either of the semi-trailer or the drawing vehicle when being so used; or b a trailer which is— i equipped with 2 or more wheels; ii designed to be used in combination with a semi-trailer with part of the weight of the semi-trailer being borne by the drawing vehicle; iii not itself a part either of the semi-trailer or the drawing vehicle when being so used; and iv used solely for the purposes of agriculture, horticulture or forestry, or for any two or for all of those purposes. 4 In Part II of Schedule 8, at the end of note (b) there be added the words “manufactured before lst February 1992”. Amendments to regulation 61 (emission of smoke, vapour, gases, oily substances, etc. ) 5 1 Regulation 61 shall be amended as follows— 2 In paragraph (1), after the word “constructed” there shall be inserted the words “and maintained”. 3 After paragraph (3A) there shall be inserted the following paragraphs— 3B Instead of complying with paragraph (1) a vehicle may comply with a relevant instrument. 3C Instead of complying with such provisions of items 1, 2 and 3 in Table I as apply to it, a vehicle may at the time of its first use comply with a relevant instrument. . 4 In paragraph (4), for the words from the beginning to “comply” there shall be substituted the words “For the purposes of paragraphs (3B) and (3C), a reference to a vehicle complying with a relevant instrument is a reference to a vehicle complying”. 5 After paragraph (10) there shall be inserted the following paragraphs— 10A Without prejudice to paragraphs (1) and (7) no person shall use, or cause or permit to be used on a road, a vehicle first used on or after the I August 1975 and propelled by a four-stroke spark ignition engine, unless the vehicle is in such a condition that, when the engine is idling— a the carbon monoxide content of the exhaust emissions from the engine does not exceed— i in the case of a vehicle first used on or after 1 August 1983, 4.5% or ii in any other case, 6%; of the total exhaust emissions from the engine by volume; and b the hydrocarbon content of those emissions does not exceed 0. 12% of the total exhaust emissions from the engine by volume. 10B Paragraph (10A) does not apply to— a a vehicle if at the date that the engine was manufactured, that engine was incapable of meeting the requirements specified in that paragraph; b a vehicle being driven to a place where it is to undergo repairs; c a vehicle which was constructed or assembled by a person not ordinarily engaged in the business of manufacturing motor vehicles of that description; d an exempt vehicle within the meaning given by paragraph (12)(a) above; e a goods vehicle with a maximum gross weight exceeding 3,500 kg ; f engineering plant, an industrial tractor, or a works truck; or g a Class V or Class VI vehicle within the meaning of the Motor Vehicles (Tests) Regulations 1981 . Signed by authority of the Secretary of State for Transport Christopher Chope Parliamentary Under Secretary of State, Department of Transport 4th July 1991