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| Friction Coefficient | Slip | dμ/ds | RCI | ||||
|---|---|---|---|---|---|---|---|
| VL | Very Low | VL | Very Low | Ldμ/ds | Low | ZFR | Zero friction road |
| L | Low | M | Medium | Mdμ/ds | Medium | VSFR | Very small friction road |
| M | Medium | H | High | Hdμ/ds | High | SFR | Small friction road |
| H | High | MFR | Medium friction road | ||||
| VH | Very High | LFR | Large friction road | ||||
| VLFR | Very Large friction road | ||||||
| HFR | High friction road | ||||||
| EFR | Extreme friction road | ||||||
