OFFICE OF PUBLIC ROADS. 863 



Additional experiments in surface treatment with oil and with 

 molasses-lime mixtures were carried out on Bradley Lane west of 

 Connecticut Avenue. 



EXPERIMENTAL WORK ON HILLSIDE AVENUE, NEW YORK CITT. 



Experimental bituminous macadam work has been performed under 

 the direction of the office on 2,000 feet of Hillside Avenue, Jamaica, 

 Borough of Queens, New York City. The work comprises 9 ex- 

 periments — 1 of oil-cement concrete, 4 of bituminous concrete, and 

 4 of bituminous macadam. Samples of stone and bituminous mate- 

 rial were tested in the laboratory of this office. The cost of material 

 and labor was carefully recorded and preserved, and a systemmatic 

 traffic census was taken. It is intended to make observations from 

 time to time of the condition of the work and to provide suitable 

 maintenance. An examination in May showed the need of patching 

 in several places. The repairs were promptly made and cost data, a 

 traffic census, and other information were noted at that time and 

 preserved for future reference and comparison. 



MEMPHIS-TO-BRISTOL HIGHWAY. 



The Memphis-to-Bristol hirjliway commission, eastern division, 

 called upon this office in the fall of 1911 for assistance in advancing 

 the construction of the road projected from Nashville to Bristol, 

 Tenn., and guaranteed the expenses of an engineer under the 

 customary rules of the office. Separate applications were required 

 from each of the counties requesting assistance, and on January 8, 

 1912, an engineer was assigned to the general supervision of the work, 

 with headquarters at Nashville. 



Surveys were organized, in most cases under the county surveyors, 

 and general plans were drawn up for uniform methods and construc- 

 tion for the entire road. 



The eastern division of the highway from Nashville to Bristol is 

 347 miles long. Of this, 183 miles were already macadamized, 19 

 miles were toll road, 21 miles had been graded, and 143 miles were 

 unimproved. Many of the unimproved sections were little more 

 than trails, and gnides entirely prohibitive existed at several places. 

 Much of the unimproved road required entire relocation, in some in- 

 stances departing several miles from the old road. 



The project developed along larger lines than expected by the 

 counties and considerable dilficultv was at first experienced in raising 

 and appropriating sufficient funds for adequate construction. This 

 difliculty has never been wholly met and much of the construction as 

 planne(l is lighter than it should be, but it is expected to improve 

 under the maintenance with the annual funds of the counties con- 

 cerned. 



On June 30, 1912, the project as a whole was advanced as follows: 

 Preliminary' surveys, 84.G per cent; final surveys, 57.3 per cent; and 

 work contracted for, advertised, or under force account, 79.1 per cent. 

 Preliminary surveys have been made of 159.2 miles and final locatitm 

 established for 85.2 miles. Contracts have been advertised or let for 

 85.5 miles. The maximum grade will be 5 per cent. 



