11. Introduction to geometric design
The chapter provides an overview of geometric design, focusing on the dimensions and layout of highway features to enhance driver safety, comfort, and efficiency. Key factors influencing geometric design include design speed, topography, and vehicle characteristics. Specific topics covered include road classification, alignment requirements, and special considerations for hilly terrains, stressing the importance of proper alignment for cost-effective and safe road construction.
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Sections
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11.2Factors Aecting Geometric Design
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11.3Road Classication
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11.3.2Modern-Lucknow Classication
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11.3.3Roads Classication Criteria
What we have learnt
- Geometric design focuses on creating highways that meet safety and efficiency standards for drivers and vehicles.
- Design speed is crucial as it influences various geometric parameters of the highway.
- Roads can be classified based on different criteria, including speed, accessibility, and usage.
Key Concepts
- -- Design Speed
- The maximum continuous speed at which vehicles can safely travel on a highway under favorable conditions, influencing sight distance and curvature.
- -- Topography
- The physical features of the landscape that impact road construction, affecting costs and design standards.
- -- Road Classification
- The categorization of roads based on speed, accessibility, and other factors to determine their design and usage standards.
- -- Highway Alignment
- The layout of the central line of the highway, which can be horizontal or vertical, influencing construction and operational costs.
Additional Learning Materials
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