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Show DURABILITY OF ROADS VARY Classification of Passenger and Freight Highways Is Predicted by "hairman Diehl. Freight roads and passenger roads are probabilities of the comparatively comparative-ly near future' in congested sections of the country, according to Chairman George C. Diehl of the A. A. A. good roads board, who has sent a communication communi-cation to this effect to the office of the chief of engineers of the War department de-partment Mr. Diehl thus comments on the up-to-date highways problem : "There will never be a time when all roads are of equal durability and carrying capacity. Highways and railroads are analogous, in that they are both designed to carry traffic, and general rules which have been developed devel-oped through scientific management of railroads apply as well almost invariably in-variably to highways. The ' heaviest locomotives and rolling stock are carried car-ried on roads like the New York Central Cen-tral and Pennsylvania and Union Pa cific. Their use over lighter constructed con-structed railroads would ruin the roads In a comparatively brief period. "There must come a classification of highways. Over class 1 the heaviest heav-iest motortrucks and trailers would be permitted ; each truck should have large figures conspicuously placed on the sides to Indicate the total weight that it was permitted to carry ; operators oper-ators and owners of trucks should be prosecuted for using the heaviest trucks oa roads designed for lighter traffic. It would be comparatively simple to rnforce such provisions, as there seems to be no defense of the proposition" permitting one or two heavy trucks to ruin an Investment of many thousand dollars on the lighter constructed highways. "At the road intersection the highway high-way capacity could be indicated, as the highway department should, I b-lieve, b-lieve, have a traffic department under a chief traffic engineer, having to do, not with construction and maintenance mainte-nance but merely with the control of traffic. It Is extremely likely that it would result ultimately in- a system of freight roads and passenger roads, and that wider and parallel roads would result ultimately in a system of freight roads and passenger roads, and that wider and parallel roads I I "Mi i I 1 - . f i r j, v : . , , - 1 i 1 Brick or Concrete Roads Are Economical Econom-ical If There Is Considerable Heavy Traffic would be found to be the most economical eco-nomical method of laying out the highway high-way system. "It is Impossible to lay out all roads of the heavy form of construction ; In the first place, the money is not available, avail-able, and, secondly, too many years i would elapse before the more sparse-1 sparse-1 ly settled sections of the country i were developed. It would not be at ' all difficult to break bulk when leaving the heavy traffic roads, and in a com-paratlvely com-paratlvely brief time an excellent theory the-ory of highway construction would be developed whereby each locality would be able to determine the amount It was feasible for them to expend on each mile of highway construction." |