# Traffic Engineering Questions and Answers – Greenberg’s Logarithmic Model

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

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)

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

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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