What is important about sampling at the roadway?

• A. Minimum of three representative samples combined.
• B. Only one sample is needed.
• C. Ten samples must be tested separately.
• D. No samples are required.

Answer: (A)

Sampling at the roadway matters because the material can vary across the site, with moisture, density, and particle size changing from spot to spot. To get a test result that truly represents what’s happening in the field, you collect multiple samples from different locations and combine them into a composite sample. This approach reduces the effect of local differences and gives a more accurate basis for setting compaction targets and evaluating material suitability. Relying on a single sample can misrepresent the in-place conditions, while taking many samples and testing them separately is often unnecessary and inefficient. Skipping sampling altogether leaves you without data to base decisions on. That’s why using a minimum of three representative samples combined is the practical, reliable method.