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Grade Separation and Interchanges

Grade separation is a method developed to avoid the disruption of traffic flow at intersections. Grade separation is adopted at junctions where two or more surface transport axes cross with each other. Different types of grade separation structures, advantages and disadvantages ...

Retaining Wall Types, Materials, Economy, and Applications

What is a retaining wall? Retaining wall is a structure that are designed and constructed to withstand lateral pressure of soil or hold back soil materials. The lateral pressure could be also due to earth filling, liquid pressure, sand, and other ...

Curves in Alignment of Highways – Types of Curves

What is a Curve in Roads? A curve is nothing but an arc which connects two straight lines which are separated by some angle called deflection angle. This situation occurs where the alignment of a road way or rail ...

What are Different Layers in a Bituminous Pavement?

Bituminous pavements are constructed in different layers such as base course, binder course and surface course. These layers are made of different materials and provides different functions to the bituminous pavements. Different Layers in a Bituminous Pavement 1. Bituminous Base Course Base course ...

Highway Surface Drainage System and Its Design

Surface drainage system is most important in Highway engineering. A pavement without proper drainage facilities will not serve for long time. The water or rainfall on road should be collected by side drains which carries the drain water to nearest ...

Factors Influencing Pavement Design

Many factors such as  number of vehicles, speed, climatic conditions and other factors affect are to be considered for the design of pavement.  In this article we will discuss about the factors  influencing pavement design. Pavements are engineered structures which are used ...