64 BULLETIN 586, U. S. DEPARTMENT OF AGRICULTURE. 
Screenings—Crusher run passing a 3-inch circular opening includ- 
ing dust of fracture; 3-inch stone, passing 1}-inch circular opening 
and retained on 3-inch opening; 13-inch stone, passing 2}-inch cir- 
cular opening and retained on 14-inch opening; 3-inch stone screen- 
ings from which dust had been removed. 
Traffic census for 11 days in 1911 showed a maximum of 2,794 
vehicles per day of 24 hours, a minimum of 655 vehicles per day of 
24 hours, an average of 1,493 vehicles per day of 24 hours. 
Table 67 indicates the method of construction of the experimental 
sections and shows their condition at the time of several inspections 
since construction. The tabulation shown has been prepared from 
detail reports of inspection and published in Circulars Nos. 98 and 
99, Office of Public Roads, and in Bulletins Nos. 105, 257, and 407, 
U. 8. Department of Agriculture. 
