Which is an example of discrete data in crash analysis?

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Study for the Road Safety Professional Level 1 Exam. Enhance your knowledge with multiple-choice questions and explanations. Prepare effectively and succeed!

Multiple Choice

Which is an example of discrete data in crash analysis?

Explanation:
Discrete data are counts that can only take whole-number values. In crash analysis, the number of crashes observed in a given time period is a count, so it can be 0, 1, 2, and so on. This makes observed crash frequency the discrete data because it represents a straight count of events. The other options are not pure discrete counts. A crash rate per 100,000 vehicles combines a count with a population to form a rate, which can be fractional and is treated as a continuous measure. Traffic volume is a flow that can vary continuously over time, even though you might record it as a count over short intervals. Average time between crashes is a duration, which is a continuous measurement. So the best example of discrete data in crash analysis is the observed crash frequency.

Discrete data are counts that can only take whole-number values. In crash analysis, the number of crashes observed in a given time period is a count, so it can be 0, 1, 2, and so on. This makes observed crash frequency the discrete data because it represents a straight count of events.

The other options are not pure discrete counts. A crash rate per 100,000 vehicles combines a count with a population to form a rate, which can be fractional and is treated as a continuous measure. Traffic volume is a flow that can vary continuously over time, even though you might record it as a count over short intervals. Average time between crashes is a duration, which is a continuous measurement.

So the best example of discrete data in crash analysis is the observed crash frequency.

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