transportation engineering can be broadly consisting of the four major parts.
transportation planning
deals with the development of a comprehensive set of action plan for the design, construction and operation of transportation facilities.
Transportation planning essentially involves the development Of a transport model which will accurately represent both the current as well as future transportation system.
Geometric design
deals with physical proportioning of other transportation facilities, in contrast with the structural design of a facilities. This include the cross - sectional features, horizontal alignment, vertical alignment and intersections. Although there are several modes of travel like road, rail, air etc., the underlying principle are common common to a great extent. Therefore emphasis will be normally given for the geometric design of roads.
Pavement analysis and design
Pavement design deal with the structural design of roads, both (bituminous and concrete) commonly known as ( flexible pavements and rigid pavements) respectively. It deals with the design of paving materials, determination of the layer thickness, and construction and maintenance procedure. The design mainly covers stextural aspects, functional aspects, drainage. Structural design ensures the pavement has enough strength to withstand the impact of loads, functional design emphasizes on the riding quality, and the drainage design protects the pavement from damage due to water.