CONSTRUCTION OF WALKS AND DRIVES 9I 



to allow them to turn on a sufficiently large 

 radius to prevent damage to the road surface. 

 The form of the "carriage-turn" is immaterial 

 if it is large enough; but if space is restricted 

 it is better to adopt the circle, or some figure 

 approximating it. 



In the case of a semicircular drive having 

 separate entrance and exit gates, the carriage- 

 turn is unnecessary, but may be retained in 

 some form as a concession to the eye, which 

 naturally looks for a free space opposite the 

 house door. 



The coming of the motor car has introduced 

 a new and insistent problem in driveway en- 

 trances to suburban plots — in the open country 

 estate the only extra modifications lie in the 

 necessity of greater, gentler curves. The factors 

 to be considered in the smaller place have been 

 well presented in Country Life^ October 1922, 

 thus: Width between automobile tires, direc- 

 tion the runway takes relative to lines of street 

 curb, width of parking space between sidewalk 

 and curb, elevation of sidewalk above curb, rela- 

 tive slopes in walk and curb, elevation of sidewalk 

 above curb, relative slopes in walk and curb, gen- 

 eral character of ground as respects lines and 



