Geometric Design (II). Learning Objectives. To calculate minimum radius of horizontal curve To understand design concepts for transition curves and compute min length To understand the role of SSD in horizontal and vertical design To define and apply grade considerations
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(Chapter 6.1 ~ 6.4)
cost, environmental impacts, sight distances, aesthetic consequences, etc.
Without Transition Curves
With Transition Curves
L: min length of spiral (ft)
V: speed (mph)
R: curve radius (ft)
C: rate of increase of centrifugal accel (ft/sec3), 1~3
Keep water drainage in mind while considering all of the available cross-section options
General Design Speed Reduction
point of vertical intersection
point of verticaltangency
point of vertical curvature