AllRounder.ai
Chapters in this course

Enrol to start learning

Reading is open to everyone. Enrolling is free, and it is what unlocks the audio lessons, practice tests and progress tracking.

Enrol free

2. Curves

The unit discusses the necessity of curves in transportation systems, specifically focusing on horizontal and vertical curves. It categorizes curves into various types and elucidates essential components and parameters for their layout. The chapter also touches upon the significance of super-elevation in enhancing road and railway safety and comfort.

Sections

Curves

This section covers the significance of curves in road and railway design, discussing various types and components, along with the importance of super-elevation.

2 Section Overview

Start current section content and materials

2.1 Introduction

This section introduces curves in communication lines, focusing on horizontal and vertical curves.

2.2 Classification of Horizontal Curves

This section covers the classification of horizontal curves including simple, compound, reverse, and transition curves.

2.2.1 Simple curves

This section provides an overview of simple curves in road and railway design, including their characteristics, applications, and essential parameters involved in their layout.

2.2.2 Compound curves

This section explores compound curves, which consist of two or more simple curves with different radii bending in the same direction.

2.2.3 Reverse curves

Reverse curves consist of two arcs bending in opposite directions with a common tangent at their junction, often used in railway sidings.

2.2.4 Transition curves

Transition curves facilitate a smooth change from a straight to a circular path, reducing vehicle jerk from centrifugal force.

2.3 Simple Circular Curves

This section details the characteristics and components of simple circular curves used in roads and railways, and explains how to compute necessary parameters for their layout.

2.3.1 Various parts of a curve

This section discusses the various components of simple circular curves, highlighting their significance in road and railway design.

2.3.2 Designation of horizontal curves

The section explains how simple circular curves are designated, focusing on the relationship between the radius and the angle subtended by a chord of a specific length.

2.3.3 Elements of a simple circular curve

This section outlines the essential elements of a simple circular curve, including the definitions and relationships of critical components required for effective design and layout.

2.3.4 Methods of horizontal curve setting

This section explains the two primary methods for setting horizontal curves using linear and angular approaches.

Learning Objectives

  • Curves are essential in transitioning between straight paths in roads and railways.

  • Different types of horizontal and vertical curves serve unique purposes and have varying characteristics.

  • Super-elevation is crucial for ensuring smooth vehicle movement on curved paths.

Key Concepts

Horizontal Curves

Curves that change the alignment or direction of a path in the horizontal plane.

Vertical Curves

Curves that change the slope of a path in the vertical plane.

Super-elevation

The banking of a curve raised above the normal horizontal plane to counteract the centrifugal force on vehicles.

Simple Curve

A circular curve connecting two straight paths with a constant radius.

Compound Curve

A curve formed by two or more simple curves with different radii.

Reverse Curve

A curve consisting of two arcs bending in opposite directions.

Transition Curve

A curve of varying radius used to provide a gradual change from a straight to a curved path.

Practice Exercises

Total Questions

2

Estimated Time

4 min

Passing Score

70%

Instructions

  • Read each question carefully
  • You can use hints if you need help
  • Complete all questions before submitting
Sign up to take this test

1 more question available

Enrol free