A major collector has three 12 foot lanes including one shared-left turn lane and 1 thru lane in each direction. A maximum super elevation rate of 6.0% has been determined for a design speed of 45 mph. What is the value of n? What is the max relative gradient? What is most nearly the runoﬀ length?

Answered: A major collector has three 12 foot…

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

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A major collector has three 12 foot lanes including one shared-left turn lane and 1 thru lane in each direction. A maximum super elevation rate of 6.0% has been determined for a design speed of 45 mph.

What is the value of n?

What is the max relative gradient?

What is most nearly the runoﬀ length?

Expert Solution

Step 1 Introduction

The banking of a road along a horizontal curve known as superelevation enables drivers to safely and comfortably navigate the curve at normal speeds. As speeds rise or horizontal curves tighten, a steeper superelevation rate is needed. Highway horizontal curves are banked to help the driver by reducing the lateral acceleration brought on by tracking the curve.

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