The Structural Engineer > Archive > Volume 4 (1926) > Issues > Issue 4 > Discussion on "Concrete Roads in America"
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Discussion on "Concrete Roads in America"

Mr. W.J.H. LEVERTON proposed a hearty vote of thanks to Major Smith for his paper dealing with the use of pneumatic tyres on heavy vehicles, he pointed out that if a tyre on a heavy vehicle, such as a bus or a lorry, were to burst, it would give a report like that of a cannon, which was not only disconcerting, but very dangerous, inasmuch as it would upset the steering. No doubt the arguments in favour of pneumatic tyres, from the point of view that they did less damage to the roads than solid tyres, were strong, but notwithstanding that, the possibility of bursts must be kept in view. The costs of construction in America, as given by the author, seemed estremely low as compared with the costs in this country. The cost of the road between Croton and Reerskill, in New York State, was given as 14s. per sq. yard, of which 5s. 4d. represented the cost of excavation, whereas he believed that, generally speaking, the cost in this country would be roughly ┬úl per sq. yard. According to the author’s figures, the cost was only 8s. 8d. per sq. yard for concrete 8 in. thick, with reinforcement. With regard to the camber of roads, a good many people considered that on roads with snrfaces such as concrete and asphalte it need not be anything like so much as on the old macadam roads. Of course, the camber tended to cause the skidding of motor vehicles, but the author of a book he had been reading recently had stated that on surfaces such as asphalte the water dried off quickly, so that the camber might be considerably reduced, and almost abolished.