Course Introduction and Two-Lane Highway Horizontal Alignment

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# Course Introduction and Two-Lane Highway Horizontal Alignment - PowerPoint PPT Presentation

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

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## Course Introduction and Two-Lane Highway Horizontal Alignment

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### 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
• Organization
• Syllabus
• Schedule
• Assignments
• Course materials
• Evaluation
Course Website (cont.)
• Purpose: course materials delivery
• Assignments
• Solutions
• Announcements
• Software files
• Class policy
• Exam schedule
• A≥90%; 90%>B ≥80%;80%>C ≥70%; 70%>D ≥60%; 60%>F
• Projects (20%)
• Twelve mini-exams (60%)
• Final exam (20%)
Horizontal Alignment
• Purpose: Review primary design elements
• Objectives
• Design circular curve alignment
• Estimate design speed of circular curve
Circular Curve Alignment
• Labels and Terms
• Point of curvature (PC)
• Point of tangency (PT)
• Point of intersection (PI)
• Curve length (L)
• External angle (Δ)
• Tangent (T)
Circular Curve Equations
• Tangent
• Curve length
• Station of PC and PT
Circular Curve Design Speed
• Side friction (fs)
• Gravity constant (g)32.2 ft/sec2
• Superelevation (e)
Circular Curve Design Speed
• Maximum Side friction standard values (AASHTO Green Book (pp. 147)
Circular Curve Design Speed
• Superelevationexpressed as rise over run

A

1 ft

e

A

A

A

Plan View

Cross-Sectional View

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)