DUST PREVENTION AND ROAD PRESERVATION, 1916. 
37 
Table 39. — Surface maintenance costs of 1915 experiments on Mount Vernon Avenue, 
Alexandria, Va.,from Jan. 1 to Dec. 31, 1916. 
Experi- 
Area. 
Cost per square yard. 
Experi- 
ment 
No. 
Area. 
Cost per square yard. 
ment 
No. 
Construc- 
tion. 
Mainte- 
nance. 
Total. 
Construc- 
tion. 
Mainte- 
nance. 
Total. 
1 
2 
3 
4 
5 
6 
7 
8 
9 
12 
Sq. yds. 
1,202.22 
2, 599. 67 
1,867.78 
1,924.00 
2, 196. 56 
1,422.22 
2, 369. 78 
1,221.33 
W 863. 22 
Cents. 
80.13 
66.43 
88.98 
74.27 
47.74 
36.85 
45.57 
57.81 
33.54 
Cents. 
7.36 
2.08 
11.90 
10.06 
2.95 
.52 
.89 
1.41 
2.94 
Cents. 
87.49 
68.51 
100. 88 
84.33 
50.69 
37.37 
46.46 
59.22 
36.48 
10 
11 
13 
14.. 
15 
16 
17 
18 
19 
20 
Sq. yds. 
5, 445. 22 
1,573.34 
1, 688. 88 
1, 777. 78 
1,742.22 
1,621.34 
1, 422. 22 
1, 580. 45 
1, 728. 00 
1, 866. 67 
Cents. 
43.74 
41.62 
48.41 
58.98 
65.77 
52.66 
63.04 
48.29 
54.26 
67.73 
Cents. 
2.10 
2.42 
.92 
1.61 
.18 
3.24 
14.02 
14.57 
11.95 
10.59 
Cents. 
45.84 
44.04 
49.33 
60.59 
65.95 
55.90 
77.06 
62.86 
66.21 
78.32 
Table 40. — Volume and character of traffic during a 16-hour period on Mount Vernon 
Avenue, Apr. 8 to Dec. 24, 1916. 
% 
North of Russell Road. 
South of Russell Road. 
Maximum. 
Average. 
Maximum. 
Average. 
North- 
bound. 
South- 
bound. 
North- 
bound. 
South- 
bound. 
North- 
bound. 
South- 
bound. 
North- 
bound. 
South- 
bound. 
1 
2 
5 
2 
4 
3 
1 
7 
1 
3 
7 
6 
2 
1 
i" 
1 
1 
2 
4 
2 
4 
1 
2 
7 
1 
1 
3 
24 
1 
17 
451 
13 
14 
2 
6 
4 
2 
1 
i* 
1 
2 
3 
Unloaded 1-horse wagon 
Loaded 2-horse wagon 
1 
1 
4 
Unloaded 2-horse wagon 
l 
1 
6 
Unloaded 4-horse wagon 
7 
7 
1 
1 
8 
32 
3 
20 
720 
21 
18 
' 2 
3 
7 
2 
1 
6 
32 
3 
16 
470 
17 
11 
2 
2 
8 
2-horse pleasure vehicle 
q 
Rubber-tired horse vehicle 
in 
96 
25 
1 
27 
715 
16 
19 
5 
7 
1 
9 
1 
5 
1 
n 
Motor cycle 
6 
12 
Excessively heavy vehicle 1 
13 
13 
270 
6 
6 
11 
257 
20 
5 
9 
201 
6 
6 
9 
14 
190 
15 
9 
16 
Unloaded motor dray 
4 
1 Very heavy vehicles, such as carry ore, stone, timber, machinery, etc. 
FALLS ROAD, MONTGOMERY COUNTY, MD., 1915. 
SURFACE TREATMENT ON WATER-BOUND MACADAM (OILS, TAR PREPARATIONS, 
REFINED TARS). 
The original report of these experiments was given in Bulletin No. 
407, U. S. Department of Agriculture. The following report describes 
the condition of the experiments on February 21, 1917. 
Experiment No. 1 — Asphaltic petroleum, cold application, correspond- 
ing to experiment No. 3 on Rockville Pike. — This surface shows a 
tendency to become mealy in cold weather, and with continued wet 
weather works up into mud. It was seen in the winter of 1915-16 
that the road could not be brought safely through another cold season, 
and a re -treatment was given late in the fall of N 19 16. The same 
material was used as for the original application, and its character- 
istics are given in Table 41. Cost data and quantities appear in 
Table 43. At the time of inspection the surface showed its charac- 
teristic tendency to work into mud, but had behaved much better as 
a whole than did the corresponding section on the Rockville Pike 
during a corresponding period after its construction. 
