IRI NHS (0)
| Good < 96 |
| Fair 96 to 170 |
| Poor 170 to 300 |
| Very Poor 300 to 400 |
| Critical > 400 |
IRI Non-NHS (1)
| Good < 96 |
| Fair 96 to 170 |
| Poor 170 to 300 |
| Very Poor 300 to 400 |
| Critical > 400 |
Rut NHS (2)
| Good < 0.20" |
| Fair 0.20 to 0.40" |
| Poor > 0.40" |
Rut Non-NHS (3)
| Good < 0.20" |
| Fair 0.20 to 0.40" |
| Poor < 0.40" |
|