DUST PEEVENTIOlSr AND ROAD PEESERVATION, 1915. 



59 



(I) Fluxed native aspTidlt 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 as'phalt 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 shght difference in the wearing of the two classes of concrete. 

 On the gravel, limestone, and trap sections, the oU-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 



We^t 



East 



Wast 



East 



West 



East 



West 



East- 



West- 



East- 



West- 





side. 



side. 



side. 



side. 



side. 



side. 



side. 



side. 



bound. 



bound. 



bound. 



l30und. 



Loaded l-horse wagon. . 



6 



22 



2 



13 



18 



14 



9 



8 



14 



10 



5 



4 



Unloafled l-horse wagon 



8 



20 



2 



10 



17 



17 



7 



8 



12 



14 



5 



5 



Loade'l 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 











l-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 



M 



689 



10 



211 



Mf, 



502 



242 



169 



300 



264 



85 



95 



Loaded motor dray 



32 



81 



2 



34 



63 



39 



30 



23 



22 



29 



13 



16 



Unloaded motor dray . . 



13 



33 



1 



12 



20 



32 



6 



10 



10 



9 



4 



4 



