Types of Intersections in Road and its Designing

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Types of Intersections in Road and its Designing
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What is an Road Intersection?

Road Intersection is where two or more roads meet and or are the points of potential vehicle conflict. They are critical element of a road section. They are normally a major bottleneck to smooth flow of traffic and a major accident spot. The general principles of design in both rural and urban areas are the same. The dangers to pedestrians and riders of two-wheeled vehicles are also great at intersections.

Grade separation is a form of intersection in which one or more conflicting movements of intersecting highways are segregated in space. An interchange is a grade separation with connecting roadways which allow route transfer between the intersecting highways. An interchange is therefore, the highest form of intersection design. The type of interchange, the shape and pattern of the interchange ramps for the various turning movements, and their design are governed by several factors such as the importance of the intersecting highways, the number of intersecting legs, the design volumes of through and turning traffic movements including their composition, the design speeds, available right of way and topography. Interchanges, therefore, are necessarily designed individually in light of the above considerations.

Intersection Design Requirement
Intersection Types
Provide adequate sight distance – for approach and departure maneuvers
Minimize turning and through conflicts
Avoid geometry (sharp curves/steep grades) that adversely impact acceleration/deceleration

Presentation Includes;
Types of Intersections
At Grade Intersection
Grade Separation
Interchange

At Grade Intersections
Three-leg intersections
Four-leg intersections
Multi-leg intersections
Roundabout intersections

Designing and its Calculations along with example.

For all details refer attached presentation
 

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