1922.] Road Regulations fob A.gricxjlti ral Tbactobs. STl 



(ii) The sum of the axle weights of an agricultural tractor and any 

 trailer drawn by it should not exceed 8 tons. 



(iii) The speed of agricultural tractors on a public highway should be 

 limited to four miles per hour, unless the tractor complies strictly with 

 the Regulations governing any other class of vehicle, in which case it 

 might proceed at the speed appropriate to that class, subject to a maxi- 

 mum of 1G miles per hour. 



(iv) Agricultural tractors should not be required to be constructed 

 with springs between any axle and the frame. 



(v) The steering wheels of an agricultural tractor should, when used 

 on roads, be fitted with a band which should be smooth, and, where the 

 tyre touches the surface of the road, flat and not less than 2\ inches 

 in width. 



(vi) The driving wheels of an agricultural tractor should be not less 

 than 30 inches in diameter, and wheels, other than driving wheels, uol 

 less than 24 inches in diameter; it is recommended that this provision 

 should not apply in the case of tractors weighing 15 cwt. or less unladen, 

 or in the case of the trailing wheels of self-contained motor ploughs. 

 This provision it is proposed should not come into operation until 

 1st April, 1923. 



(vii) All agricultural tractors should be fitted with two brakes, with 

 the exception of : — ■ 



(a) Tractors under 20 cwt. in weight, used exclusively for hauling 

 agricultural implements and agricultural machinery : 



(b) Tractors of the " caterpillar 1 ' type up to 30 cwt. in weight, used 

 exclusively for hauling agricultural implements and agricultural 

 machinery. 



(c) (Up to 1st April, 1923) tractors between 20 cwt. and 30 cwt. in 

 weight used exclusively for hauling agricultural implements and 

 agricultural machinery. 



In these cases one brake only, it is considered, need be fitted. 



(viii) One identification plate only should be required on agricultural 

 tractors used exclusively for hauling agricultural implements and agri- 

 cultural machinery, such plate to be affixed in front of the tractor. 



(ix) Driving wheels of agricultural tractors used exclusively for 

 hauling agricultural implements and agricultural machinery should, as 

 regards their tread, be either smooth and flat, or flat but fitted with 

 diagonal crossbars of not less than 3 inches in width nor more than 

 | inch in thickness, extending the full width of the tyre, provided that 

 the space intervening between each pair of crossbars should not exceed 

 3 inches. The crossbars should be so disposed throughout the tyre thai 

 the aggregate extent of the crossbars or crossbar in the course of a 

 straight line drawn horizontally across the circumference of the wheel 

 would nowhere be less than half the width of the tyre. The width "t 

 the driving wheels should be such as t<» allow no greater load per inch 

 width of wheel than 3 cwt. 



(x) Agricultural tractors of the •* caterpillar " type should he legalised 

 for the same purposes as wheeled tractors, provided that those parts "1 

 the track which are in contact with the ground are either flat or rounded 

 and have a minimum width or diameter of inch. The total area of the 



