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Pavement samples used for reference measurements.
| ID | Diameter (mm) | Height (mm) | Description |
|---|---|---|---|
| 1 | 102 | 31 | Fresh, bituminous and coarse pavement |
| 2 | 102 | 29 | Heavily worn, low bitumen |
| 3 | 102 | 29 | Heavily worn and cracked |
| 4 | 95 | 62 | Slightly worn, large grain |
| 5 | 153 | 59 | Artificially smooth |
