44 BULLETIN 257, XT. S. DEPARTMENT OF AGRICULTURE. 



Experiment at Bucexin. 



This road was inspected November 11, 1914, when wheat hauling 

 had begun. 



The cross section of the road had gradually flattened, and two 

 wide ruts (12 inches wide by 1 inch deep) had formed throughout 

 its entire length. There were numerous places where the surface 

 had begun to fail in the ruts, but only a few where the sand-clay 

 surface had entirely cut through. The largest of the latter were in 

 the immediate approach to the bridge. There were about 25 de- 

 pressions and 5 holes through the surface. 



Outside the ruts a slight ridge had formed, the outer edges of 

 which were overgrown with grass. The ditches were covered with 

 a heavy growth of grass, but were well defined and open. 



The depressions and holes should be filled with clay, and the road 

 should be reshaped with a grader to prevent the formation of second- 

 ary ditches inside the existing ones. 



Experiment at Ford. 



This road was inspected November 11, 1914. It was generally in 

 good condition except within 100 feet of the bridge, where there 

 were three holes cut through the sand-clay surface. In the remainder 

 of the road there were several depressions which should be filled 

 with fresh clay before dragging the road. There were two ruts 

 extending the entire length of the road, which were about 12 inches 

 wide and 1 inch deep. The ditches were well defined, and the road- 

 way would be in excellent condition if it were dragged and repairs 

 made at the places noted. 



SUPPLEMENTARY REPORT OF EXPERIMENT MADE AT BOWLING 



GREEN, KY., 1907. 



KENTUCKY ROCK ASPHALT. 



The original report of this experiment was published in Circular 

 No. 89, and reports of annual inspections are given in Circulars Nos. 

 90, 92, 94, 98, and 99, Office of Public Roads, and in U. S. Depart- 

 ment of Agriculture Bulletin No. 105. The inspection on which the 

 following report is based was made on November 5, 1914. 



The experiment has had no maintenance whatever, and owing to 

 the accumulation of dirt on the surface it was impossible to make a 

 thorough inspection. Such information as could be gained by clean- 

 ing the surface in places and digging into depressions seemed to in- 

 dicate that the condition was not greatly changed since the last in- 

 spection. There are numerous holes throughout the west end, but 

 the relative number decreases as the east end is approached. In 

 many of these holes the rock asphalt has practically disappeared, 

 and the remaining stones are loose. In areas where the rock asphalt 

 has not failed the surface remains quite smooth. 



o 



