Read this article to learn about: 1. Objectives of highway planning 2. Necessity of highway planning in India 3. Principle of Highway Planning 4. Highway Planning Process 5. Importance of Highway Planning. Introduction to Highway Planning: Planning is a prerequisite for any engineering activity or project; this is particularly true for the development of a highway network or system in [...]
In this article we will discuss about:- 1. Definition of Highway Capacity 2. Importance of the Concept of Highway Capacity 3. Factors Affecting Capacity and Level of Service 4. Traffic Capacity Formula. Definition of Highway Capacity: Highway capacity is associated with traffic volume and traffic density. Traffic volume is the number of vehicles passing a given point on a roadway [...]
Traffic Signals: Notes, Importance and Methods Used for the design of traffic signals. The following definitions, concepts and explanations are useful or important in and relevant to the design of traffic signals. (i) Time Cycle: The period of time required for the complete sequence of signal aspect at any one arm of an intersection from red to the onset of [...]
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 [...]
When two or more roads intersect or cross, the users of these roads have to necessarily adjust their movement in order to avoid 'collision'; this adjustment could be by way of reduction in speed and/or change in the path of their motion. An intersection is defined as "the general area where two or more highways join or cross, within which [...]
Materials Used for the Construction of Roads: Methods, Process, Layers and Road Pavement! A wide variety of materials are used in the construction of roads these are soils (naturally occurring or processed), aggregates (fine aggregates or coarse aggregates obtained from rocks), binders like lime, bituminous materials, and cement, and miscellaneous materials used as admixtures for improved performance of roads under [...]
In this article we will discuss about how to design bituminous mixes for construction of roads [with mix formula]| . Design of Bituminous Mixes: The steps in the design of bituminous mixes are: Selection of Aggregate and Grading: Aggregates which possess the desired qualities of strength, hardness, toughness, and soundness are selected. Crushed stone aggregates and sands of angular particles [...]
The following tests are conducted to assess the suitability or quality of bitumen for specific use as a paving material and also for read making: 1. Specific Gravity: Specific gravity of a binder material does not affect its bonding characteristics. However, its value is needed in bituminous mix design. This is determined at 27°C using a standard pyknometer. The bitumen [...]
The following tests are conducted on tar to check or assess its suitability or quality for specific uses in road construction: 1. Specific Gravity: For determining the specific gravity of tar, the same procedure as for bitumen using a pyknometer is applicable. 2. Distillates: A distillation flask of about one litre capacity is filled with a weighed quantity of tar [...]
Highway Pavement: Layers, Functions, Types, Defects, Rigid and Flexible Pavements! Pavement design, in general, consists of determining the thickness of the pavement or of the several layers of which it is composed in order to resist the wheel loads of the traffic and transmit them safely on to the foundation soil. Thus, the strength of the pavement must be adequate [...]