A rotary intersection is a specialised form of intersection-at-grade in which the traffic movies in one direction round a central island. For 'keep-to-the-left' rule, vehicles approaching the intersection are forced to move around the central island in an orderly manner and weave out of the rotary into their respective desired directions. Design Elements of a Rotary: A number of elements [...]
Design of pavements has been based on experience and judgment in the past. But the design methodology has taken rapid strides towards rationality in the past few decades based on an understanding of the stresses and strains in the layers constituting the pavement and application of the concept of reliability in achieving the desired level of service during the pavement's [...]
A good highway network provides several benefits to the general public and the society at large. However, any new highway project, or improvements to an existing highway for meeting increased traffic demands should be justified from the economic point of view. That is to say, an analysis of the economic cost - the initial cost and maintenance cost over the [...]
Highway economic analysis, also known as highway project appraisal, involves quantification of the costs of and benefits from a scheme over a selected time horizon and evaluation by a common yardstick. The technique is also known as benefit-cost analysis. Such economic evaluation serves a number of purposes: (i) To rank different schemes within the highway sector. (ii) To assist in [...]