STRUCTURES IN LANDSCAPE 221 



road turns about an obstacle, it should not of course turn so sharply as 

 to discommode the traffic ; on the other hand, having turned as sharply 

 as it conveniently can, it should set off directly for its next necessary 

 point of turning and should not lie upon the landscape in a series of 

 broad and unnecessary loops. It should be remembered in designing 

 a road on plan that it is seen in reality in sharp perspective, and that a 

 slight curve, so long as it is virile and definite, is likely to be of sufficient 

 effect. 



Where a road comes into or intersects another, the first considera- Road Inter- 

 tion is the smooth flow of traffic in plan and in profile from each road sectwns 

 into the other. The practical considerations, then, of gradient, pos- 



UAMTY BY 



AJVJTATIOAI TO qROUND AMJ> TJWTIC 



AN EASY XOAJ>- JUNCTION" 

 VIEW DOWAT SJ&E-l?OAt> 

 BLOCKED BY ISLAND 



QEOMtTRlC UKITV 



TYPICAL PLANS 

 OF CURVING ROADS 



SUBORDINATION Of 5WICC.-RaM> 

 BY SHARPER CURVATURE- 



DRAWING XXVIII 



sible radius of turning of an automobile, and view from one road to 

 another to prevent accidents, must come first. If the curved con- 

 tinuation of the side-line of one road into that of another undesirably 

 increases the road surface at the junction, then it may perhaps be well 

 to lead the roads into each other by still more gentle curves and so to 

 Droduce islands between the branches of the roads, which may be 

 :overed with low planting to conceal any undue amount of road sur- 

 : ace. (See Drawing XXVIII, above.) 



