城市道路设计10.ppt

文档介绍：School of Civil Engineering
孙仁娟
11/21/2017
URBAN ROAD DESIGN
Lecture 8-
Grade Separations and Interchanges
Outlines
Interchanges
Ramps
Interchanges
Interchange Configurations
Three-leg designs
Four-leg designs
Approaches to the structure
The general controls for horizontal and vertical alignment and bination should be adhered to closely.
In particular, any relatively sharp horizontal or vertical curves should be avoided.
Gradients that may slow mercial vehicles or that may be difficult to negotiate under icy conditions should be avoided.
Reduction of vehicle speeds by long upgrades encourages passing, which is undesirable in the vicinity of ramp terminals.