Professional Course

Roadway Horizontal Alignments

PDHengineer, Online
3 hours
89.90 USD
Next course start
Start anytime! See details
Self-paced Online
3 hours
89.90 USD
Next course start
Start anytime! See details
Self-paced Online
This provider usually responds within 48 hours 👍

Course description

engineer in tunnel

In Roadway Horizontal Alignments, you'll learn ...

  • What is side friction factor and how to calculate it
  • Methods for attaining superelevation in a spiral curve
  • Cases where speed, curvature, or width may require appropriate traveled way widening
  • How intersection sight distance varies according to the different types of traffic control
  • Procedure for coordination of horizontal and vertical alignments


Credit: 3 PDH

Length: 51 pages

The roadway horizontal alignment is a series of horizontal tangents (straight roadway sections), circular curves, and spiral transitions. It shows the proposed roadway location in relation to the existing terrain and adjacent land conditions. Together with the vertical alignment (grades and vertical curves) and roadway cross-sections (lanes, shoulders, curbs, medians, roadside slopes, ditches, sidewalks), the horizontal alignment (tangents and curves) helps to provide a three-dimensional roadway layout.

In today’s environment, designers must do more than merely apply design standards and criteria to ‘solve’ a problem. They must understand how various roadway elements contribute to safety and facility operation, including the horizontal alignment.

This course focuses on the geometric design of horizontal alignments for modern roads and highways. Its contents are intended to serve as guidance and not as an absolute standard or rule. Upon course completion, you should be familiar with the general design of horizontal roadway alignments. The course objective is to give engineers and designers an in-depth look at the principles to be considered when designing horizontal alignments.

Do you work at this company and want to update this page?

Is there out-of-date information about your company or courses published here? Fill out this form to get in touch with us.

Upcoming start dates

1 start date available

Start anytime!

  • Self-paced Online
  • Online

Who should attend?

Certificate of Completion

You will be able to immediately print a certificate of completion after passing a multiple-choice quiz consisting of 25 questions. PDH credits are not awarded until the course is completed and quiz is passed.

Training content

This course teaches the following specific knowledge and skills:

  • What is horizontal alignment
  • Why design speed selection is a critical decision that should be done at the beginning of the planning and design process
  • Maximum superelevation rates and minimum curvature
  • How grades affect superelevation rates
  • Locations where "tangent-to-curve" transitions are used
  • The AASHTO equation for determining the minimum length of superelevation runoff
  • How to locate a curve's superelevation runoff with respect to its Point of Curvature (PC)
  • When to use spiral curves
  • The AASHTO formula for the minimum length of a spiral curve
  • Maximum spiral radius
  • Minimum and maximum spiral length
  • Length of tangent runoff and superelevation runoff in a spiral curve
  • Axis of rotation when a median is present
  • Two types of drainage problems for pavement surfaces in superelevation transition sections
  • Factors that impact the amount of widening on horizontal curves needed for offtracking
  • Determination of stopping sight distance (SSD) and decision sight distance (DSD)
  • Design values for passing sight distance on two-lane highways
  • General controls for horizontal alignments


This course costs $ - Contact PDHengineer to learn about discounts and upcoming offers

Why choose PDHengineer?

 Trusted by over 60,000 engineers to meet PDH requirements

Earn reward tokens with each course purchase

Triple guarantee that courses will be accepted by your state licensing board

Contact this provider

Contact course provider

Before we redirect you to this supplier's website, do you mind filling out this form so that we can stay in touch? You can unsubscribe at any time.
If you want us to recommend other suitable courses, please fill out all fields below and check the box beside "Please recommend similar options"
Country *

reCAPTCHA logo This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply.
7915 FM 1960 West, Suite 130
77070 Houston Texas

Professional Engineers have trusted PDHengineer to provide high-quality PDH courses since 2003. A large library of PDH courses and live, interactive webinars means that engineers can find PDH course material covering all of the major engineering disciplines. Plus, all PDHengineer...

Read more and show all training delivered by this supplier