DUST PREVENTION AND ROAD PRESERVATION, 1916. Bi 
TABLE 39.—Surface maintenance costs of 1915 experiments on Mount Vernon Avenue, 
Alexandria, Va., from Jan. 1 to Dec. 31, 1916. 
Cost yard. Cost F 
Experi- ie ost per square y Raperk: : ost per square yard 
ment rea - || ment Area. | - 
= Construc-| Mainte- Construc-| Mainte- 
No. tion. nance. | Total. || No. tion. nance. | otal. 
Sq. yds. | Cents. Cents. Cents. | Sq. yds. | Cents. Cents. | Cents. 
De can 3 1, 202. 22 80. 13 7.36 87.49 || 10........ 5, 445. 22 43.74 2.10 45. 84 
DF e = 2, 599. 67 66. 43 2.08 CASEY Bab (eS 1, 573.34 41.62 2.42 44.04 
Qeeeeaas- 1, 867.78 88. 98 11.90 4008 SS) 21322: 20% 1, 688. 88 48.41 - 92 49.33 
Ae oe 1,924.00 74. 27 10. 06 84.33 || 14. --..--- 1,777.78 58. 98 1.61 60. 59 
Deecesaas 2, 196. 56 47.74 2.95 50. 69 || 15........ 1, 742. 22 65. 77 .18 65. 95 
G2esesss 1, 422.22 36. 85 -52 BY Beth ee eesee 1, 621.34 52. 66 3.24 55. 90 
W (eee 2,369.78 45.57 . 89 A646) Wie: oo 1, 422. 22 63. 04 14.02 77.06 
See e eee 1, 221.33 57. 81 1.41 E74) | Wake ae ig oe 45 48. 29 14. 57 62. 86 
UE ates x ih! eee 1, 728. 00 54.26 11.95 66. 21 
NERS oa 6 pa beer ha wegecee|, <= Seen lain a ee 1,866.67| 67.73] 10.59] 78.32 
Taste 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-| South- | North- | South- } North- South- | North-| South- 
bound. | bound.}| bound.} bound.| bound.) bound.| bound. | bound. 
1 | Loaded 1-horse wagon--.-......-- 2 Shes. 1 2 ele ct | 1 
2 | Unloaded 1-horse wagon...-.-..-- 5 7 1 1 4 6 1 | 1 
3 | Loaded 2-horse wagon........-- 2 Gilt: exes eh cee e 2 Ze ee She 1 
4 | Unloaded 2-horse wagon........ 4 2) 1 1 4 2 1 | ae ee 
5 | Loaded 4horse wagon. ........-. 3 1 ee ee 1 i a ene meee tar a TN? BD 
6 | Unloaded 4-horse wagon..-....-. ThS | Pree ease es Sa ee lees nace DN peas cae een gee eee 
7 | 1-horse pleasure vehicle.......-. 7 7 2 | 3 7 7 2 | 2 
8 | 2-horse pleasure vehicle.......-. 1 Molec cieverste| aetes = fe 1 7AM eesaee nae Beeeesee 
9 | Rubber-tired horse vehicle......|......-- Typeset eee Ae 1 iby ee Cee BER el eee 
POuSaddle horse... 2.022622 sess <5 96 8 5 1 3 6 1| 1 
igiiolLorieycle-s3 438.9 30 beets 25 32 7 9 24 32 5 | 6 
12 | Excessively heavy vehicle ! e 1 Bilenseeeeoesmsee 1 3 [Gaeta Peeeses 
13 |} Motor runabout --.-.-....-- 3 27 20 13 Be 17 16 9 | 9 
14 | Motor touring car-........ i 715 720 270 257 451 470 201 190 
15 | Loaded motor dray...........-- 16 21 6 20 13 17 6 | 9 
16 | Unloaded motor dray....-.-.... 19 18 6 5 14 il 6 | 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 expervment 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 1916. 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 surtace 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. 
