Architect and engineer . CROSS SECTION OF A HIGHWAY, SHOWING A CORRUGATED PIPE IN A SETTLING FILL. of the country to the other. It might besaid that this indicates faulty road build-ing, and that the highway base should beso constructed as not to permit any such;^ettlement. But every practical highwayengineer or supervisor knows that wehave thousands of miles of improvedhighways whereon such requirementscannot be met, to say nothing of a mil-lion miles or more of unimproved earthroads. And many highway foundationswhich were considered absolutely rigidten years ago are now yielding and set-tlin
Architect and engineer . CROSS SECTION OF A HIGHWAY, SHOWING A CORRUGATED PIPE IN A SETTLING FILL. of the country to the other. It might besaid that this indicates faulty road build-ing, and that the highway base should beso constructed as not to permit any such;^ettlement. But every practical highwayengineer or supervisor knows that wehave thousands of miles of improvedhighways whereon such requirementscannot be met, to say nothing of a mil-lion miles or more of unimproved earthroads. And many highway foundationswhich were considered absolutely rigidten years ago are now yielding and set-tling under the tremendous onslaughts ofthe motor trucks. The point of importance is that whena highway foundation around a corru-gated culvert shifts or settles, the culvertsettles with it, without suffering anynoticeable injury. Of course, it is notideal for a culvert pipe to be severalinches lower in the middle than at eitherend; but such a condition is much to bepreferred to a breakdown of the entirestructure; and under
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