16 



BULLETIN/ 257, U. S. DEPARTMENT OF AGRICULTURE. 



The following table shows the results of a traffic census taken be- 

 tween 6 in the morning and 12 midnight on three successive days in 

 January, 1915. 



Table 9. — Volume and character of traffic over experiments at West Palm Beach, Fla., on 

 three successive days in January, 1915. 



Vehicles. 



Saturday, 



Sunday, 



Monday, 



Jan. 23.1 



Jan. 24.2 



Jan. 25 . 3 



North- 



South- 



North- 



South- 



North- 



South- 



bound. 



bound. 



bound. 



bound. 



bound. 



bound. 



7 



6 



2 



1 



3 



7 



4 



4 



1 



3 



7 



7 



5 



2 



1 



1 



5 







4 



2 











1 



4 



3 



4 



1 



2 



2 



2 



15 



19 



12 



10 



16 



15 



11 



14 







3 



8 



14 



127 



114 



82 



84 



97 



102 



1 



2 











1 



3 



1 



1 



1 



1 



3 







101 



141 



49 



65 



118 



130 



Aver- 

 age per 

 day. 



Loaded 1-horse wagons . . . 

 Unloaded 1-horse wagons . 

 Loaded 2-horse wagons . . . 

 Unloaded 2-horse wagons. 

 1-horse pleasure vehicles . . 



Motor cycles 



Motor runabouts 



Motor touring cars 



Loaded motor trucks 



Unloaded motor trucks.. . 

 Bicycles 



8.7 

 8.7 

 4.7 

 3.7 

 4.7 

 29.0 

 13.3 



202.0 

 2.3 

 2.3 



201.3 



i Heavy rain morning and evening; showers all day. 



2 Heavy rain 6 to 7 a. m., 12 to 6 p. m.; showers balance of day. 



3 Heavy rain 10 a. m. to 1 p. m.; showers balance of day. 



SUPPLEMENTARY REPORT OF EXPERIMENTS AT MIAMI, FLA., 1913. 



OIL-CORALLINE ROCK. 



The original report of these experiments will be found in U. S. 

 Department of Agriculture Bulletin No. 105. When inspected and 

 repaired on January 29, 1914, the surface treatment in experiments 

 Nos. 1 and 2 had worn so badly that repairs were out of the question. 

 It had broken through in a number of places, exposing the soft under- 

 lying rock to excessive wear, and this finally resulted in such a rough 

 and objectionable surface that both sections were later scarified, 

 regraded, and rolled without further treatment. The remaining 

 experimental sections were repaired where necessary by patching all 

 holes and breaks in the surface in the following manner: 



The surface was cut away around the affected areas to form holes 

 about 4 inches deep, with straight, sharp edges. These were filled 

 with a thorough mixture of pit-run rock and the light-oil ]:>roduct, 

 with care to use- only sufficient oil to coat all the particles. The mix- 

 ture was tamped in place in layers about 1 inch thick. The following 

 table shows the extent and cost of these repairs: 





Table 10. — Cost of repairs to experiments 



at Miami 



Fla. 





Experiment No. 



Area of 



patches 



(square 



feet). 



Cost. 



Cost per 

 square 

 yard. 



3 







3 



24 







$0.00 



.89 



7.17 



.00 



SO. 000 



4 



.002 



5 - 



.013 



6 



.000 







