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Show nuns fob tie m Iw ISHINGTON 'Twnt7iht million mil-lion Vires arc now yearly BeeMluy o equip th passenger automobiles Ind motor trucks In use fn the United (fs To thlp should be added not imu than 12,000,000 more tires, for mlar vehicles accumulate mileage to 'uch' an extent that a second set of '-,, is necessary, to sa nothing of the thousands of inner tubes. Forty million tires and their inner libel at an average cost of $25 fives ' total tire bill of $1,000,000.000 a iftlrlv tidy annual expenditure for road Intel and transportation Hence it is von note how the writer proposes to effect of the various road surfaces m the motor vodici msu-au ui cm ,i. ring only the damage by the mo lor vehicle to the road," says M O 'dredge, director of roads of th merlcan Automobile association. ou can scarcely pick up a papei without seeing in its something aboui j,0- and why the faM movlim passenger pass-enger car ani ihe loaded motor truck damage the road, and as you read on I ,u note how th writer proposes to de- ! n j highv-jn to withstand these ef-frif ef-frif .'ncl hnv. speed and weights ihould be distributed "Few of those who discuss questions live thought to the fact that our 7,-"i)0,000 7,-"i)0,000 motor cars which require annually an-nually 28,000,000 tires, exclusive of renewals, re-newals, create a problem: Namely, iiow fast will these tireK wear out on each type of road surface? Compare for instance the smooth resilience of Fifth avenue wilh the rough, gritty and flint surface so often encountered on country roads, and try to Imagine what a tidy sum in tire bill? would be saved if we could travel on avenue surfaces. Tbe saving in tiro costs Mone would pav the difference In con-strurtion con-strurtion cost in many instances How much does the road surfaces ?oern the amount of gaollne required requir-ed by the motor vehicle" This is an important and timely question, for rihf now serious minds are worrying ofr the future of power surfaces for motor cars. No conclusive tests have been made on all types of road under absolutely uniform condition and with .i-inlerested motives. Such data as !:as been assmbled shows that road surfaces offer tractive resistances lining all the way from HOO pounds or more per ton for aand and loose cia c 1 to 20 pounds and less for the he?' grades of smooth hard-surfaced pavements. The?e lesis, however, should be andardited and made authoritative I so we can tell whether the saving in : tires and fas and car and engines Justify Justi-fy a change in tjpe or modification of the conception that the road, and nor tbe vehicle is the principal consider 1 ation." |