| Variable | Fuzzy set | |
|---|---|---|
| Input | Vehicle type | Small |
| Medium | ||
| Big | ||
| Very big | ||
| Location | At node | |
| Close to node | ||
| Far from node | ||
| Time | Night | |
| Early morning | ||
| Morning | ||
| Afternoon | ||
| Afternoon peak time | ||
| Evening | ||
| Report mechanism | ETS used | |
| No ETS used | ||
| Output | Duration | Very short |
| Short | ||
| Medium | ||
| Long | ||
| Very long |
Key: ETS = emergency telephone service.