ROADS AND BRIDGES, JULY 1, 1913—DEC. 31, 1914. 3 
ing concrete, at $0.199 per square yard, $182.37; setting forms, $15.63; and mis- 
cellaneous labor, $10.50. 
BITUMINOUS-MACADAM ROADS. 
DADE County, LEMON CiTy, FLA.—Work was conducted on an experimental 
object-lesson road beginning about one-fourth mile north of Lemon City, on the 
Biscayne Drive, during January and February, 1914. The work consisted of 
the construction of five sections of bituminous-macadam road; the stone was a 
local coralline rock, with various bituminous materials for the top coat. The 
surfaced width was 18 feet and the length 334.4 feet, making a total area of 
668.8 square yards. 
The total cost of the work was $420.77, or $0.629 per square yard. 
Detailed description will be found in Progress Report of Dust Prevention and 
Road Preservation for 1914.’ 
PauM BEACH COUNTY, WEST PALM BEACH, FLA.—Work was conducted on an 
experimental object-lesson road beginning at a point about 2 miles south of 
West Palm Beach, on the Miami-Quebec Highway, during April, 1914. The 
work consisted of the construction of seven sections of bituminous-macadam 
road. The stone was a local coralline rock, with various bituminous materials 
for the top coat. The surfaced width was 15 feet and the length 860 feet, 
making a total area of 1,483 square yards. 
The total cost of the work was $808.17, or $0.564 per square yard. 
A detailed description will be found in Progress Report of Dust Prey ention 
and Road Preservation, 1914.* 
AvGusTa CouNTY, STAUNTON, VA.—Work was begun on a road leading from 
Staunton toward Middlebrook on September 16, 1913. This office furnished a 
representative for the purpose of instructing the local authorities in applying 
the bituminous surface. He superintended the laying of one kind of bitumin- 
ous material and turned this one section over to the local authorities on Sep- 
tember 29, 1913, with 24 days lost due to bad weather. 
When the office representative arrived this road had heen graded 21 feet 
wide in both cuts and fills for a length of 1,700 feet. The subgrade, 15 feet 
wide, had been prepared, the shaping was practically done, and most of the 
first course of rock had been placed. 
The adjacent land is rolling and the natural swil is clay and rock. The 
erushed rock was a limestone with good binding qualities and a fair wearing 
quality. It was loaded into wagons by gravity from the bins, hauled about 
three-quarters of a mile, and dumped on the road in piles and spread with 
rakes and shovels. 
On the prepared subgrade the No. 1 stone, ranging from 2 to 3% inches in 
size, had been spread to a depth of 5 inches and rolled until compacted to 34 
inches. On this course was spread 3 inches of loose No. 2 stone, ranging from 
three-fourths inch to 2 inches in size, and rolled until compacted to 2 inches. 
The bituminous binder was spread on this course at the rate of 14 gallons tu 
the square yard. This was covered with screenings varying from one-fourth 
to three-fourths inch in size. The road was then rolled, and a seal coat of 
about one-half gallon of bituminous binder applied. The binder was delivered 
in a tank car and heated by steam from a pump station of the Chesapeake & 
Ohio Railroad. At the time of the departure of the office representative 2,106 
1 Bulletin No. 257, U. S. Dept. of Agriculture. 
