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 A highway pavement is a structure consisting of superimposed layers of processed materials above the natural soil sub-grade, whose primary function is to distribute the applied vehicle loads to the sub-grade. The pavement structure should be able to provide a surface of acceptable riding quality, adequate skid resistance, favorable light reflecting characteristics, and low noise pollution. The ultimate aim is to ensure that the transmitted stresses due to wheel load are sufficiently reduced,An ideal pavement should meet the following requirements: Sufficient thickness to distribute the wheel load stresses to a safe value on the sub-grade soil, Structurally strong to withstand all types of stresses imposed upon it, Adequate coefficient of friction to prevent skidding of vehicles, Smooth surface to provide comfort to road users even at high speed, Produce least noise from moving vehicles, Dust proof surface so that traffic safety is not impaired by reducing visibility, Impervious su...

                [Introduction] The word autocad is made up   of two word - -  Auto ( logo of company)  - cad ( computer aidid design).  Automatic Computer Aided Design is the full form of AutoCAD which made by company named ‘Autodesk’. A word AutoCAD came from its function which has automatic understanding of command when user give it and returns required output as per user requirement. Autocad is the 2D & 3D modeling software.  It is doveloped by Autodesk company.  Autodesk is an U. S. A.  Based Company It is widely used in industry for 2D design and 3D modelling.  In another way we can say that autocad is a designing course which is preformed by the help of computer.  Autocad software was firstly launched autodesk company  in Dec 1982. It's come in india 1988. The first version of autocad was R1 after R2, R3, R4,...... And so on.  In 2000 autodesk launched a version of autocad 2000 ...