Introduction to Sustainable Civil Engineering Design
1st Edition
ISBN: 9780134013916
Author: Neumann
Publisher: PEARSON
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Chapter 1, Problem 2EDDS
To determine
Explain the reason for classifying the freeway with a ramp metering system as a system with a feedback.
Sketch a flowchart similar to that of Figure 1.11 and label the lines and boxes with terms applicable to access the control of a freeway.
Expert Solution & Answer
Explanation of Solution
Ramp metering system:
- 1. The ramp metering system is used to regulate the volume of traffic that enters the freeways, depending upon the current traffic conditions.
- 2. The usage of this system reduces the traffic congestion and improves the safety of the driver.
- 3. The ramp metering system has two signals namely red and green signals.
The classification of this system as a system with a feedback relies on the fact that the system has significant input and output with a positive consequence (feedback) over the environment.
For example, the output of the ramp metering system are less traffic congestion, reduced pollution, and increased driver safety. These outputs show that the feedback is positive and also the system is most suited to the environment.
Sketch the flowchart for the ramp metering system as shown in Figure 1.
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QUESTION 1
The approaches of a 4-leg signalized intersection are configured with 1 NB lane, 1 SB lane, 1 EB lane, and 1 WB lane and each of these
lanes serves LT, TH, and RT movements. The following volumes and phasing are provided.
approach EB
WB
NB
SB
movement LT TH RT LT TH RT LT TH RT LT TH RT
volume
120 480 160 80 560 100 20 200 40 12 160 48
2
6
What is the critical sum for the EB/WB barrier?
Chapter 1 Solutions
Introduction to Sustainable Civil Engineering Design
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