Transportation Engineering - Vol 1 | 15. Horizontal Alignment II by Abraham | Learn Smarter
K12 Students

Academics

AI-Powered learning for Grades 8–12, aligned with major Indian and international curricula.

Professionals

Professional Courses

Industry-relevant training in Business, Technology, and Design to help professionals and graduates upskill for real-world careers.

Games

Interactive Games

Fun, engaging games to boost memory, math fluency, typing speed, and English skills—perfect for learners of all ages.

Typing
Memory
Math
English Adventures
Knowledge
15. Horizontal Alignment II

The chapter covers essential principles of horizontal alignment, focusing on the design and implementation of superelevation in roadway engineering. It highlights guidelines and formulas for ensuring road safety for various types of vehicles while navigating curves, along with concepts of mechanical and psychological roadway widening. The discussion emphasizes the importance of considering both design speed and lateral friction in determining appropriate superelevation and curve radius.

Enroll to start learning

You’ve not yet enrolled in this course. Please enroll for free to listen to audio lessons, classroom podcasts and take practice test.

Sections

  • 15

    Horizontal Alignment Ii

    This section covers the design of superelevation in road geometry and the necessary guidelines for ensuring safety on curves.

    Learning Practice

  • 15.1

    Overview

    This section provides an overview of superelevation design and associated pavement widening considerations for road curves.

    Learning Practice

  • 15.2

    Guidelines On Superelevation

    This section outlines the design guidelines for superelevation in road construction, considering various vehicle types and traffic conditions.

    Learning Practice

  • 15.2.1

    Design Of Super-Elevation

    This section outlines the principles of designing super-elevation for safe road curves, considering vehicle dynamics and traffic conditions.

    Learning Practice

  • 15.2.2

    Maximum And Minimum Super-Elevation

    This section discusses the IRC guidelines for maximum and minimum super-elevation related to slow-moving vehicles and heavy-loaded trucks.

    Learning Practice

  • 15.2.3

    Attainment Of Super-Elevation

    This section explains the methods used to attain super-elevation on roadways, including the elimination of pavement crown and various methods of cross-section rotation.

    Learning Practice

  • 15.3

    Radius Of Horizontal Curve

    The radius of horizontal curves is critical for determining safe driving speeds and is influenced by factors such as superelevation and friction.

    Learning Practice

  • 15.4

    Extra Widening

    Extra widening is the additional carriageway width required on curved road sections due to mechanical and psychological effects.

    Learning Practice

  • 15.4.1

    Mechanical Widening

    Mechanical widening is the additional carriageway width required on a curved road to accommodate vehicle dynamics, particularly the off-tracking phenomenon.

    Learning Practice

  • 15.4.2

    Psychological Widening

    Psychological widening addresses the need for additional pavement space at curves to accommodate drivers' tendencies to drive closer to the road edges.

    Learning Practice

  • 15.5

    Summary

    This section summarizes the design principles of superelevation as mandated by IRC guidelines for road safety, particularly at curves.

    Learning Practice

  • 15.6

    Problems

    This section presents various problems related to the design of superelevation and pavement widening at curves for a national highway.

    Learning Practice

References

15.pdf

Class Notes

Memorization

What we have learnt

  • Superelevation is crucial f...
  • IRC guidelines establish ma...
  • Extra widening is necessary...

Final Test

Revision Tests