Geometric and Pavement Design for Upgrading Gravel Road to Paved Road

Abstract

The highway transportation system is one of the most commonly used modes of the transportation system in Ethiopia. Our Proposed Project covers the design of Local Street.In our country there are different problems on the highway, most of the problems are regarding the design and material quality. With regarding this problem we will try to give a clampdown on the problem associated with this. Therefore as much as possible as streamline we are performing the project consideration as follows: identifying topography of project terrain type, perform geometric design, Pavement design through conducting essential test and providing adequate thickness and providing well drainage system. The main report is divided into eight chapters. In this project design Report, the first chapter includes Overview of Transportation System and the second chapter is details and description of the location project, critical evaluation of climate, topography, traffic survey and analysis which is design period entails traffic volume (AADT), traffic growth rate and the third chapter deals with Data Collection and Analysis, Topographic surveying, Soils investigation, and Sub-grade material investigation. And the fourth chapter details design control, Road Functional classification, Design speed, Level of service (LOS), Design Vehicles, Traffic Study (traffic volume determination), Traffic forecasting, Limitations of traffic forecasting, and Topography. The fifth chapter deals on the geometric design of those areasTerrain, horizontal alignment, vertical alignment, gradient, cross-section element, selection and configuration of the elements that comprise the roadway cross-section,and describes the elements used in carrying out detailed cross-section design. The sixth chapter is referees pavement design which is flexible pavement by both AACRA and ERA with the help of traffic analysis and soil laboratory results. Chapter seventh is also a study about highway drainage and culvert design using annual average rainfall &climate of our project area and the sixth chapter describes earthwork including earthwork quantity and mass haul diagram. The last chapter describes the general conclusions and recommendations of this project