Motor Vehicles (Authorisation of Special Types) Order (Northern Ireland) 1997

Engineering plant — further conditions

22.  The further conditions referred to in Article 21 are—

(a) engineering plant shall be used on a road only—

(i) for testing or demonstration purposes or delivery on sale;

(ii) for proceeding to or returning from a manufacturer or repairer for repair or maintenance;

(iii) for proceeding to or from the site of engineering operations or when actually engaged in such operations;

(b) engineering plant may carry its own necessary gear and equipment but no other load, except—

(i) engineering plant other than a mobile crane, when actually engaged on the construction, maintenance or repair of roads, may carry materials which it is specifically designed to treat while being carried on the vehicle or excavated materials which have been raised from the ground by apparatus on the motor vehicle or trailer, and

(ii) a mobile crane, when actually engaged in engineering operations, may lift or transport a load;

(c) a mobile crane shall not be used on a road to lift or transport goods or burden except when actually engaged in engineering operations;

(d) engineering plant other than a mobile crane shall only draw a trailer which is engineering plant or a living van or office hut used in connection with the construction, maintenance and repair of roads;

(e) no mobile crane shall draw a trailer;

(f) the vehicle shall be so constructed that it is either a wheeled vehicle or a track-laying vehicle;

(g) (i) save as provided in sub-paragraphs (ii) and (iii), in the case of a wheeled motor vehicle regulations 3, 9, 16(1), 21, 25, 27 to 30, 32, 37, 39, 40, 48, 50, 52, 56, 57, 59 to 63, 67, 80, 83, 86, 91 to 98 and 100 to 103 of the Construction and Use Regulations shall apply;

(ii) in the case of a machine designed for use and used solely for the purpose of laying materials for the repair or construction of road surfaces, if the weight transmitted to the road surface by any two wheels in line transversely does not exceed 11,180 kilograms, regulation 21 of the said Regulations shall not apply;

(iii) in the case of a motor vehicle designed for use in work of construction or repair of road surfaces, the wheels of which are equipped with pneumatic tyres specially provided with smooth treads for such use and which is incapable by reason of its construction of exceeding a speed of 20 miles per hour on the level under its own power, regulation 25(1)(f) and (g) of the said Regulations shall not apply;

(h) (i) save as provided in sub-paragraph (ii), in the case of a wheeled trailer, regulations 3, 9, 16(1), 21, 25, 27, 32, 86, 92, 93, 97 and 103 of the Construction and Use Regulations shall apply;

(ii) in the case of a trailer designed for use in work of construction or repair of road surfaces and the wheels of which are equipped with pneumatic tyres specially provided with smooth treads for such use, regulation 25(1)(b) of the said Regulations shall not apply;

(i) (i) save as provided in sub-paragraphs (ii) and (iii), in the case of a track-laying motor vehicle regulations 3, 16(1), 21, 25 to 28, 32, 35, 40, 56, 63, 83, 86, 88, 94 to 96, 98, 100, 102 and 103 of the Construction and Use Regulations shall apply;

(ii) in the case of a motor vehicle registered on or before 31st December 1951 regulations 29 and 32 of the said Regulations shall not apply;

(iii) in the case of a motor vehicle which is a road roller regulation 26 of the said Regulations shall not apply;

(j) (i) save as provided in sub-paragraph (ii), in the case of a track-laying trailer regulations 3, 16(1), 21, 25 to 27, 32, 86 and 97 of the Construction and Use Regulations shall apply;

(ii) in the case of a trailer which is a road roller regulation 26 of the said Regulations shall not apply;

(k) (i) save as provided in sub-paragraph (ii), all the wheels of a vehicle which are not equipped with pneumatic tyres or tyres of soft or elastic material shall be equipped with smooth tyres and have the edges rounded to a radius of not less than 12 millimetres and not more than 25 millimetres;

(ii) in the case of gritting machines designed for use and used for gritting frosted and icebound roads all or any of the tyres may be shod with diagonal cross bars of equal width of not less than 25 millimetres, extending the full breadth of the tyre and so arranged that the distance between adjacent cross bars is not greater than the width of the cross bars;

(l) in the case of any vehicle the weight transmitted to the road surface by any one wheel not equipped with pneumatic tyres where no other wheel is in the same line transversely or by all the wheels not equipped with pneumatic tyres in line transversely shall be such that the average weight per 25 millimetres width of tyre in contact with such surface does not exceed 765 kilograms;

(m) (i) save as provided in sub-paragraphs (ii) and (iii), a motor vehicle shall be equipped with an efficient brake;

(ii) in the case of a motor vehicle propelled by steam the engine shall be deemed to be an efficient brake if the engine is capable of being reversed;

(iii) in the case of a motor vehicle registered on or after 1st January 1952 any brake required by this paragraph shall be capable of being set so as to hold the vehicle when stationary unless another brake fitted to the vehicle is capable of being so set;

(n) a trailer shall be equipped with an efficient brake or with suitable scotches or other similar devices to hold the vehicle stationary when necessary;

(o) (i) subject to sub-paragraph (ii), no motor vehicle which exceeds 7.93 metres in overall length shall draw a trailer;

(ii) sub-paragraph (i) shall not apply to a motor vehicle which is drawing a broken down vehicle in consequence of the breakdown;

(p) the sum of the weights transmitted to the road surface by all the wheels and tracks of a vehicle shall not exceed 152,400 kilograms;

(q) the overall length of a vehicle shall not exceed 27.4 metres;

(r) the overall width of a vehicle shall not exceed 6.1 metres;

(s) as respects weight—

(i) the weight transmitted to the road surface by any one wheel of a vehicle, other than a heavy motor car registered on or before 31st December 1951 or a trailer manufactured before 1st January 1952, shall not exceed 11,430 kilograms, and for the purposes of this part of this sub-paragraph any two wheels shall be treated as one wheel if the distance between the centres of the areas of contact between such wheels and the road surface is less than 610 millimetres;

(ii) the weight transmitted to any strip of road surface upon which the wheels of a vehicle rest contained between any two parallel lines drawn on that surface at right angles to the longitudinal axis of the vehicle shall not exceed, if the parallel lines are not more than 610 millimetres apart, 45,720 kilograms and, thereafter, additional weight shall be permitted, for any distance apart of the parallel lines in excess of 610 millimetres but not exceeding a total distance apart of 2.13 metres, at a rate of 30,000 kilograms per metre and thereafter, additional weight shall be permitted, for any distance apart of the parallel lines in excess of 2.13 metres, at a rate of 10,000 kilograms per metre;

(iii) the total weight transmitted to the road surface by any wheels of a vehicle in line transversely not fitted with pneumatic tyres shall be such that the average weight per 25 millimetres width of tyre in contact with the road surface shall not exceed 765 kilograms; and

(iv) in the case of a track laying vehicle, in addition to the foregoing restrictions, the weight transmitted by each track thereof to any strip of road surface contained between any two parallel lines drawn on that surface at right angles to the longitudinal axis of the vehicle shall not exceed, if the parallel lines are not more than 610 millimetres apart, 11,430 kilograms, and, thereafter, additional weight shall be permitted, for any distance apart of the parallel lines in excess of 610 millimetres but not exceeding a total distance apart of 2.13 metres, at a rate of 7,500 kilograms per metre and, thereafter, additional weight shall be permitted, for any distance apart of the parallel lines in excess of 2.13 metres, at a rate of 2,500 kilograms per metre.