1 / 12

Course Introduction and Two-Lane Highway Horizontal Alignment

Course Introduction and Two-Lane Highway Horizontal Alignment. Lecture 1: CE 578 Highway Traffic Operations. Course Topics. Highway traffic operations Two-lane highway emphasis (40%) Remainder on freeways (60%). Course Website. Address: www.webs1.uidaho.edu/ce578 Organization Syllabus

ostinmannual
Download Presentation

Course Introduction and Two-Lane Highway Horizontal Alignment

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Course Introduction and Two-Lane Highway Horizontal Alignment Lecture 1: CE 578 Highway Traffic Operations

  2. Course Topics • Highway traffic operations • Two-lane highway emphasis (40%) • Remainder on freeways (60%)

  3. Course Website • Address: www.webs1.uidaho.edu/ce578 • Organization • Syllabus • Schedule • Assignments • Course materials • Evaluation

  4. Course Website (cont.) • Purpose: course materials delivery • Assignments • Solutions • Class reading • Announcements • Software files • Class policy • Exam schedule

  5. Course Grading • A≥90%; 90%>B ≥80%;80%>C ≥70%; 70%>D ≥60%; 60%>F • Grade is based on: • Projects (20%) • Twelve mini-exams (60%) • Final exam (20%) • Assignments not graded

  6. Horizontal Alignment • Purpose: Review primary design elements • Objectives • Design circular curve alignment • Estimate design speed of circular curve

  7. Circular Curve Alignment • Labels and Terms • Point of curvature (PC) • Point of tangency (PT) • Point of intersection (PI) • Curve length (L) • Curve Radius (R) • External angle (Δ) • Tangent (T)

  8. Circular Curve Equations • Tangent • Curve length • Station of PC and PT

  9. Circular Curve Design Speed • Side friction (fs) • Curve radius (R) • Gravity constant (g)32.2 ft/sec2 • Superelevation (e)

  10. Circular Curve Design Speed • Maximum Side friction standard values (AASHTO Green Book (pp. 147)

  11. Circular Curve Design Speed • Superelevationexpressed as rise over run A 1 ft e A A A Plan View Cross-Sectional View

  12. Assignment • Horizontal curve alignment (circular) • Verify the following are correct for a given design on US 12 at curves with PC 242+86.8 and PC 283+01.7, given the curve radius, curve PC, and external angle • PI (not shown in plans), • T, • PT, and • L. • Estimate the design speed for the above curves, given the plan sheet superelevations and radius (note: superelevation for the first curve is 0.1’/ft)

More Related