ROADS AND BRIDGES 



299 



Where the road is to be covered with gravel, or with 

 a mixture of gravel, sand and clay, or with other forms 

 of materials which are not very hard nor especially pre- 

 pared, a great deal of common sense must be used in 

 writing specifications and in following them. It is 

 usually better to express the plan in terms somewhat 

 general, but to make the requirements rigid as to secur- 

 ing the very best roadbed practicable under conditions 

 which may develop as the work nears completion, and 

 then have the work done under a competent superin- 

 tendent. Each new road undertaken brings up new 

 problems. 



