Research Article
Mixed Transportation Network Design under a Sustainable Development Perspective
Table 1
Decision variables of link grade and its corresponding information in China.
| Link status variable | 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 |
| Link grade | No-way | 4th-level | 3rd-level | 2nd-level | 2nd-level | 1st-level | 1st-level | Highway | Highway | Highway | Lane | 0 | 2 | 2 | 2 | 4 | 4 | 6 | 4 | 6 | 8 | Design speed | 0 | 40 | 60 | 80 | 100 | 100 | 100 | 120 | 120 | 120 | Capacity | 0 | 1500 | 3000 | 4000 | 6000 | 15000 | 20000 | 30000 | 45000 | 60000 | Construction cost (tens of thousands of Yuan/km) | 0 | 80 | 200 | 500 | 800 | 1500 | 3000 | 4000 | 6000 | 7000 |
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