# Traffic Engineering Questions and Answers – Representation of OD Studies

This set of Traffic Engineering Multiple Choice Questions & Answers (MCQs) focuses on “Representation of OD Studies”.

1. What are desire lines?
a) Illustrations on a map showing the flow of people or goods from point to another
b) Illustrations on a map showing wind direction
c) Separates two lanes
d) Separates the soldiers from the lane

Explanation: Desire lines are illustrations on a map showing the flow of people or goods from point to another based on the values from a matrix. TransCAD Transportation Planning Software is used to illustrate desire lines.

2. Which one of the following is a disadvantage of a desire line?
a) The real distance and direction may be distorted
b) Shows volume and direction of movement
c) Can be superimposed onto a base
d) Width of lines proportional to value

Explanation: The disadvantage of a desire line is that the real distance and direction may get distorted in order to get a clear image. The advantages are that it shows volume and direction of movement, can be superimposed onto a base, and width of lines proportional to value.

3. Which of the following represents traffic volume from one key area to another in a desire line map?
a) Dark line
b) Circles
c) Triangles
d) Dots

Explanation: Dark line of varying widths represents traffic volume from one key area to another in a desire line map. The desire line map locates pictorially the major traffic routes.

4. Which of the following represents traffic volume from one key area to another in a route volume map?
a) Circles
b) Bars
c) Lines
d) Dots

Explanation: Bars signifying volume superimposed on an actual road map is used to represent traffic volume from one key area to another in a route volume map. Route volume map is a graphical representation.

5. What are traffic analysis zones?
a) Study area divided into a number of small units
b) Group of study areas
c) Points of the study area
d) Zones of maximum traffic

Explanation: Traffic analysis zones (TAZ) are study areas divided into a number of small units also known as zones. The zone within the study area is known as internal zones.
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6. What is a zone centroid?
a) Point at which all attributes and properties are concentrated
b) Point at which traffic is maximum
c) Point at which surveyor takes data
d) Point at which study area changes

Explanation: Zone centroid is the point at which all attributes and properties are concentrated. The centroids are connected by centroid connectors to the nearest road junction or rail station.

7. What is the assumption taken in case of zoning models?
a) All individuals have the same travel cost from the centroid to the nearest transport facility
b) All individuals have different travel cost from the centroid to the nearest transport facility
c) All zones have the same travel cost
d) Models are assumed to have constant travel cost

Explanation: The assumption taken in case of zoning models is that all individuals have the same travel cost from the centroid to the nearest transport facility. That is considered to be average for that zone.

8. The intersection from outside is normally represented through ______
a) external zones
b) internal zones
c) zone centroid
d) study centre

Explanation: The intersection from outside is normally represented through external zones. The external zones are defined by the catchment region of the major transport links feeding to the study area.

9. Which of the following is not an aspect of data preparation?
a) Data correction
b) Data expansion
c) Data validation
d) Data dilation

Explanation: Data correction, data expansion, and data validation are the three aspects of data preparation. The raw statistics collected in the survey needs to be processed before direct application in the model. So data preparation is an essential step.

10. Which of the following is not a type of data correction in the data preparation process?
a) Household size correction
b) Socio-demographic correction
c) Non-response correction
d) Input correction

Explanation: Input correction is not a type of data correction in the data preparation process. Household size correction, socio-demographic correction, non-response correction, and non-reported trip correction are the types of data corrections in a data preparation process.

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