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The figure presents the time-space diagram for traffic on a highway that is suddenly stopped for a certain time and then released. Which of the following statements is true?

1. Speed is higher in Region R than in Region P
2. Volume is lower in Region Q than in Region P
3. Volume is higher in Region R than in Region P
4. Density is higher in Region Q than in Region R

Correct answer: Density is higher in Region Q than in Region R

Solution

In a traffic jam or stopped region, vehicle spacing decreases, so density increases. Region Q corresponds to the congested/stopped condition, while Region R has comparatively lower density. Hence density is higher in Region Q than in Region R.

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