PUBLIC THOROUGHFARES 



195 



Often there would be a gain in economy as well as 

 in beauty by so doing. 



The importance of having good drainage, easy 

 grades and solid road-beds is becoming well under- 

 stood by highway engineers, so no space will be given 

 to these matters here. Where grades change, how- 

 ever, some engineers are inclined to make this change 



FIG. 42. PROFILE OF ROAD. The upper profile indicates the character of 

 grades not unusual in cities with long straight sections connected by compara- 

 tively short curves. The lower profile is a continuous curve which gives 

 a more satisfactory appearance. 



too abruptly, so that the road profile appears angular 

 instead of curved as it should (Fig. 42). 



At the road intersections, when for some reason 

 the center lines do not meet, there is an opportunity 

 frequently to use curves to advantage so that there 

 will be a continuous roadway without jogs (Fig. 43). 

 In cities with paved streets and curbs, the radius of 

 curvature of the curb at corners should be long enough 

 so that an automobile can follow the curb closely in 

 turning to the cross street. A radius of at least 



