Traffic Engineering Questions and Answers – Greenberg’s Logarithmic Model

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This set of Basic Traffic Engineering Questions and Answers focuses on “Greenberg’s Logarithmic Model”.

1. According to Greenberg’s Logarithmic Model, what is the relation between speed and density?
a) Linear
b) Logarithmic
c) Parabolic
d) Exponential
View Answer

Answer: b
Explanation: According to Greenberg’s Logarithmic Model, speed and density have a logarithmic relationship. The Greenberg’s Logarithmic Model can be derived analytically.

2. Which of the following given options shows the correct relationship between speed and density according to Greenberg’s Logarithmic Model?
a) v = vo ln(kj*k)
b) v = vo ln(kj+k)
c) v = vo ln(kj-k)
d) v = vo ln(kj/k)
View Answer

Answer: d
Explanation: v = vo ln(kj/k) is the correct relationship between speed and density according to Greenberg’s Logarithmic Model. Greenberg’s Logarithmic Model is a macroscopic stream model.

3. What is the main drawback of Greenberg’s Logarithmic Model?
a) Density tends to infinity, speed tends to zero
b) Mean speed tends to zero, speed tends to infinity
c) Density tends to zero, speed tends to infinity
d) Flow tends to zero, speed tends to infinity
View Answer

Answer: c
Explanation: The main drawback of Greenberg’s Logarithmic Model is that the density tends to zero and the speed tends to infinity. This reveals the incapacity of the model to predict the speeds at lower densities.
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Manish Bhojasia - Founder & CTO at Sanfoundry
Manish Bhojasia, a technology veteran with 20+ years @ Cisco & Wipro, is Founder and CTO at Sanfoundry. He lives in Bangalore, and focuses on development of Linux Kernel, SAN Technologies, Advanced C, Data Structures & Alogrithms. Stay connected with him at LinkedIn.

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