DUST PREVENTION AND ROAD PRESERVATION , 1915. 
59 
(I) Fluxed native asphalt No. 2. — About 60 per cent of the treat- 
ment is gone from the west half but the east half remains almost in- 
tact. 
(J) Oil asphalt No. 2. — About 35 per cent of the surface treatment 
is gone from the west quarter of the road. The remainder is almost 
intact. 
Experiment No. 4 (Oil-Cement Concrete) and Experiment No. 5 (Cement 
Concrete). 
During the interval of another year there appears to have devel- 
oped a slight difference in the wearing of the two classes of concrete. 
On the gravel, limestone, and trap sections, the oil-cement appears 
to have worn a little more than the cement concrete. The trap 
section especially has become much rougher for a width of 2 feet 
along the gutter. The marked difference in the wear on the east and 
west sides is perhaps more noticeable than at last inspection. 
Experiment No. 6. — Vitrified Brick. 
There is no plainly visible difference in wear between the several 
sections of this experiment. 
A traffic census has been taken on this road every thirteenth day 
for a 16-hour period. A tabulation of the maximum and average for 
each class of traffic from March 8, 1915, to February 22, 1916, is given 
in Table 59. The west side of the road carries south-bound traffic 
coming from the railroad and the east side carries north-bound traffic 
toward the railroad. 
Table 59. — Volume and character of traffic on Connecticut Avenue north and south of 
Bradley Lane and on Bradley Lane. 
North. 
South. 
Bradley Lane. 
Vehicle. 
Maximum. 
Average. 
Maximum. 
Average. 
Maximum. 
Average. 
East 
West 
East 
West 
East 
West 
East 
West 
East- 
West- 
East- 
West- 
side. 
side. 
side. 
side. 
side. 
side. 
side. 
side. 
bound. 
bound. 
bound. 
bound. 
Loaded 1-horse wagon. . 
6 
22 
2 
13 
18 
14 
9 
8 
14 
10 
5 
4 
Unloaded 1-horse wagon 
8 
20 
2 
10 
17 
17 
7 
8 
12 
14 
5 
5 
Loaded 2-horse wagon. . 
12 
82 
5 
34 
21 
88 
9 
32 
30 
12 
10 
6 
Unloaded 2-horse wagon 
55 
34 
14 
16 
80 
12 
30 
4 
8 
19 
1 
7 
Loaded 4-horse wagon. . 
2 
4 

1 
3 
3 
1 
1 
3 
2 
1 

Unloaded 4-horse wagon 
1 
1 


1 
1 



1 


1-horse pleasure vehicle . 
5 
16 
1 
7 
15 
10 
7 
5 
11 
13 
4 
4 
2-horse pleasure vehicle. 

3 


5 
3 
1 

3 
3 


Rubber-tired horse ve- 
hicle 

10 
6 

50 
35 

2 
1 
1 
3 
13 
1 
10 
22 

13 
17 

3 
11 

3 
9 

5 
24 

43 
13 

1 
8 

Saddle horse 
3 
Motor cycle 
7 
Excessively heavy ve- 
hicle 
1 
22 
9 
136 

4 
1 
59 
5 
171 
5 
120 
1 
70 
1 
47 
2 
67 
3 
66 

25 
1 
Motor runabout 
28 
Motor touring car 
84 
589 
10 
211 
546 
502 
242 
169 
300 
264 
85 
95 
Loaded motor dray 
32 
81 
2 
34 
53 
39 
30 
23 
22 
29 
13 
16 
Unloaded motor dray. . 
13 
33 
1 
12 
20 
32 
6 
10 
10 
9 
4 
4 
