THE GEOMETRIC DESIGN OF ROADS
Minister of Road Transport and Highways has Indicated that India will be adding 30 KM of New Road per day to road inventory which is a 10 fold increase from current 3 KM per day. Now central government has started clearing many highway projects, preparation of New National Highways and Improvement of Urban and Rural Road under Pradhanmanthri Gram Sadak Yogaja is getting developed all over India. Proper Road design is one of the major challenges that comes up while starting a new road project or Improvement of Existing Road (Road widening project).
WHAT IS ROAD DESIGN?
The geometric design of roads is the branch of highway engineering concerned with the positioning of the physical elements of the roadway according to standards and constraints. The basic objectives in geometric design are to optimize efficiency and safety while minimizing cost and environmental damage. Geometric roadway design can be broken into three main parts: alignment, profile, and cross-section. Combined, they provide a three-dimensional layout for a roadway.
The geometric designs are referred to the latest IRC publications and MORT&H circulars regarding design standards for National Highways in India, geometric design guidelines. The relevant Indian design standards considered include:
SEQUENCE OF DESIGN
- IRC: 64-1990: Guidelines for Capacity of Roads in Rural Areas (First Edition);
- IRC: 65-1976: Recommended Practice for Traffic Rotaries;
- IRC: 66-1976: Recommended Practice for Sight Distance on Rural Highways;
- IRC: 73-1980: Geometric Design Standards for Rural (Non-Urban) Highways;
- IRC: 86-1983: Geometric Design Standards for Urban Roads in Plains
- Importing surveyed data
- Creating a DTM(Digital terrain model)
- Designing horizontal and vertical alignments
- Creating cross sections along the horizontal alignment and vertical profiles.
- Computing the earthwork and design layer volumes.
- Presentation of drawings.
All these activities are done in sequence to present a perfect design. ESurvey CADD is one of the most popular home grown software to achieve these activities quickly and accurately. Esurvey CADD provides a complete and comprehensive design solutions which caters to all the design requirements and also attempts to solve many complex design problems. With ESurvey CADD most of the Road Design aspects such as Horizontal Curve, Vertical Curve, Super Elevation, Road Widening, Profile Correction, Earthwork Calculation can be achieved accurately and easily. Impressive Cross Section Drawings can be created from ESurvey CADD which makes this product unique.
Mr Ayanakanti Murali Babu is the Road Design, Domain Expert at ESurveying and has automated many processes related to Road Designing by using his extraordinary skills in Microsoft excel that comes from his rich experience of fifteen years in Designing National Highway, Rail and Road designs. With vast experience in preparing detailed project reports, feasibility reports and other reports pertaining to various types of roads, the Expert has also been involved in several execution projects in the capacity of Project manager, Highway engineer, Chief Surveyor, etc. In his early years, he has also rendered services to many esteemed companies varying from consultants, Contractors and Concessionaire.