| Functional class | Sample size | Mileage | Estimated speed (mph) | Measured speed (mph) |
|---|---|---|---|---|
| 1 | 2 | 17.3 | 70.7 | 71.2 |
| 2 | 6 | 35.1 | 56.4 | 60.3 |
| 6 | 2 | 7.6 | 51.1 | 53.1 |
| 7 | 6 | 52.4 | 54.0 | 54.7 |
| 8 | 30 | 175.6 | 47.1 | 48.5 |
| 9 | 74 | 188.6 | 35.7 | 41.2 |
| 11 | 1 | 3.3 | 72.0 | 74.3 |
| 12 | − | − | − | − |
| 14 | 7 | 15.9 | 35.7 | 38.8 |
| 16 | 26 | 51.6 | 31.2 | 30.5 |
| 17 | 7 | 15.6 | 29.6 | 32.5 |
| 19 | 64 | 68.2 | 23.0 | 23.2 |