58 
BULLETIN 586, U. S. DEPARTMENT OF AGRICULTURE. 
Local failures occurred in sections K and L amounting in all to about 
200 square feet. A profile has been run along both sides and along 
the center of the experiments indicating that there has been consider- 
able settlement in the sections where local failures occurred. It was 
expected that repairs would be made in the spring by cutting out the 
depressed areas, keying the edges carefully and patching with brick 
similar to that used in the original work. 
A traffic census has been taken on this road every 13 days for a 
24-hour period. A tabulation of the maximum and average for each 
class of traffic for the calendar year 1916 is given in Table 62. The 
west side of the road carries south-bound traffic coming from the 
railroad and the east side carried north-bound traffic toward the 
railroad. 
The total cost of each experiment to December 31, 1916, are shown 
in Tables 59 and 63. 
Table 62. — Volume and character of traffic on Kensington Road north and south of 
Bradley Lane. January l to December 30, 1916. 
North. 
South. 
Maximum. 
Average. 
Maximum. 
Average. 
North j South North South North South ; North South 
bound. ' bound. ; bound, bound, bound. ' bound, bound, bound. 
Loaded 1-horse wagon 
Unloaded 1-horse wagon. . . 
Loaded 2-horse vragon 
Unloaded 2-horse vragon. . . 
Loaded 4-horse wagon 
Unloaded 4-horse wagon. . . 
One-horse pleasure vehicle. 
Two-horse pleasure vehicle. 
Rubber-tired horse vehicle. 
Saddle horse 
Motor cycle 
Excessively heavy vehicle l 
Motor runabout .'. 
Motor touring car 
Loaded motor dray 
Unloaded motor dray 
18 
24 
1 
1 
1 
5 
10 
8 
5 
38 
-V.3 
32 
13 
30 
20 
60 
30 
3 
1 
21 
6 
3 
11 
32 
5 
127 
635 
S2 
40 
2 
12 
1 
54 
264 
51 
12 
IS 
17 
10 
8 
9 
16 

7 
17 
58 
7 
23 
49 
15 
21 
4 
3 
2 
1 
10 
1 
12 
6 
5 
4 
1 
3 
10 
15 
3 
3 
50 
39 
13 
12 
6 
/ 
1 
1 
206 
143 
78 
56 
S5> 
711 
386 
293 
71 
59 
43 
35 
30 
24 
7 
12 
i Very heavy vehicles, such as carry ore, stone, timber, machinery, etc. 
Table 63. — Surface maintenance costs of 1912 experiments at Chevy Chase. Md., to 
December 31. 1916. 
Area 
Maintenance cost of experiments. 
Total cost per square yard. 
Experiment No. 
Total for 
experi- 
ments to 
Dec. 31, 
1915. 
1916. Total. 
Construc- 
tion. 
Mainte- 
nance. 
Total. 
1 
9 
So. fds. 
1,49S ' 
1.400 
4'. 178 
1,744 
3'. 013 ! 
2.055 | 
S3. 25 
7.66 
3.57 
20.50 
22.73 
1.77 
$3.25 
S3. 61 11.27 
Cents. 
1S6. 62 
19o.65 
2154.95 
2 150.25 
2 142.29 
25S.21 
Cents. 
0.22 
.80 
8.19 
2.19 
1.03 
.16 
Cents. 
1>6. S4 
196. 45 
3i 
4 i 
338. 76 
17.66 
8.28 
1.59 
342. 33 
3S.16 
31.01 
3.36 
163.14 
152.44 
143.32 
6 
25S.37 
1 In the progress report for 1915 the square yardage of experiment No. 4 included all oil-cement concrete. 
In October. 1916, sections G. H, I, and J were' surface treated with bituminous materials and torpedo sand, 
restoring them to their original condition, and reducing the area of the oil cement concrete experiment to 
1,744 square yards, as originally constructed. The area "of experiment No. 3, which is now entirely surface- 
treated, is correspondingly increased to 4.17S square yards. 
- Weighted average price for different sections. 
