AM Speed Index (0)
| < 60 |
| 60 - 80 |
| 80 - 95 |
| 95 - 115 |
| > 115 |
Midday Speed Index (1)
| < 60 |
| 60 - 80 |
| 80 - 95 |
| 95 - 115 |
| > 115 |
PM Speed Index (2)
| < 60 |
| 60 - 80 |
| 80 - 95 |
| 95 - 115 |
| > 115 |
All Hours Speed Index (3)
| < 60 |
| 60 - 80 |
| 80 - 95 |
| 95 - 115 |
| > 115 |
Overnight Speed Index (4)
| < 60 |
| 60 - 80 |
| 80 - 95 |
| 95 - 115 |
| > 115 |
|