Engineering and Contracting . 050 1,125 1,200 1,275 7 ins. tClass U 750 825 900 975 1,050 1,125 1,200 1,275 7 ins. Macadam 1,000 1,100 1,200 1,300 1,400 1,500 1,600 1,700 6 ins. Concrete 1,000 1,100 1,200 1,300 1,400 1,500 1,600 1,700 1 Specifications to be ap- Brick 1,100 1,200 1,300 1,400 1,500 1,600 1,700 |-proved by State High- J way (Commissioner,•oeveral types (i. e., sand, clay, etc.) for light top course, stone or slag bottom or stone top course, slag or gravel Iiottom course. TABLE II.—ROADS LUILT UNDER STATE SUPERVISION for Kind. wh
Engineering and Contracting . 050 1,125 1,200 1,275 7 ins. tClass U 750 825 900 975 1,050 1,125 1,200 1,275 7 ins. Macadam 1,000 1,100 1,200 1,300 1,400 1,500 1,600 1,700 6 ins. Concrete 1,000 1,100 1,200 1,300 1,400 1,500 1,600 1,700 1 Specifications to be ap- Brick 1,100 1,200 1,300 1,400 1,500 1,600 1,700 |-proved by State High- J way (Commissioner,•oeveral types (i. e., sand, clay, etc.) for light top course, stone or slag bottom or stone top course, slag or gravel Iiottom course. TABLE II.—ROADS LUILT UNDER STATE SUPERVISION for Kind. which rewarded. Miles. State reward. Total cost. Class A J ft. % 13, $ 88, Gravel 9 ft, 1, 737, 3,215, Macadam 3 ft. 524, 2,559, Concrete 9-16 ft. 97, 947, All oth»r types 300, 1,010, Totals 2, $1,672, $7,821, I mr-ans for rewarding the construction of goodroads. This law recognized the principles men- s 3^01. 0 05 SO S5 30 35 40 US 50A veraqe haul of surfacing material in miles Fig. 1. Curve Show/ing the Effect of Lengthof Haul on Cost of Surfacing in Michi-gan. tioned and considered the road, as it then was,a community utility. Method of Rcivarding.—It provided a flatrate reward, or contribution toward the costafter the road was completed, for the firstfive listed kinds of road shown in Table I,in amount equal to that shown for the These rewards were payable eitherto townships or counties for each mile of roadconstructed in accordance with the require-ments of a minimum specification. The func-tion of the Highway Department was primarilythe educating of road officials in constructionmethods, the supervising of the rewarded roadsand the collection and transmittal of data andinformation relative to roads. Very soon after this development the con-stantly increasing number of autorhobiles andtrucks with their greater radius of economichighwa
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