| Factor | B1 | B2 | B3 |
| Accessibility (B1) | 1 | 3 | 5 |
| Geographical barriers (B2) | 1/3 | 1 | 2 |
| transport type (B3) | 1/5 | 1/2 | 1 |
| Total | 1.53 | 4.5 | 8 |