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Southland Times, Issue 22008, 6 May 1933, Page 13

An interesting experiment is being made on the Stirling-Carlisle (England) road at the instance of the Highways Department. Part of the route is being laid with iron plates, which are ribbed to prevent slipping, perforated to let water escape, and interlocked to ensure that there will be no dangerous gaps. It is claimed that the new method dispenses with costly foundations; only a layer of ashes and a covering of tar macadam are said to be necessary. In permanence and cheapness of upkeep it will be greatly superior to all existing plans. Traffic surveys are the means of obtaining and collating definite data upon which sound conclusions may be based The weakness of many surveys is that they apply only to conditions at a given time. New problems are constantly arising, and new conditions have to be met. These new conditions often are results of methods applied after the first survey.