Show Modern Design Everyone knows what a curve is in in the road for instance Not everyone however appreciates the fact that changes in grade as well as changes in direction must be connected connected con con- with curves The curve that rounds the ups and downs dO is a vertical vertical vertical verti verti- cal curve A vertical curve between two hills has to be long enough to aVoid the roller-coaster roller dip effect in fast moving automobiles Modern highway design indicates th the need for a much flatter curve in such a place than mere comfort would require For safety the curve must be long enough so that the headlight headlight headlight head head- light beams will strike the car sufficiently far ahead |