130 HIGHWAY CONSTRUCTION 



upon the material of which it is formed, the width of the roadway, the 

 extent and nature of the traffic, and the condition of repair and clean- 

 liness in which it is maintained, it follows that in no two streets is the 

 endurance or the cost the same, and the difference between the highest 

 and lowest periods of endurance and amount of cost is very con- 

 siderable. 



The comparative cost of the various street pavements, including 

 interest on first cost, sinking fund, maintenance, and cleaning, when 

 reduced to a uniform standard traffic of 100,000 tons per annum for 

 each yard in width of the carriageway, is about as follows : 

 Comparative Cost of Various Pavements 



MATERIAL 



ANNUAL COST 

 PER SQ. YD. 



Granite blocks 



Asphalt street 



Brick 

 Wood . . 



0.40 

 0.35 

 0.50 



