1. day & night system
2. bus & metro & train & tram match line color(red, yellow, orange etc.)
3. add tram system
4. need a big airport (ex : domestic air(small), international air(big)) and big train station
5. underground intersection (3 layer or more)
6. gas power plant, parking garage
7. need more natural resources (iron, coal etc.)
8. add Intercity Bus Terminal (terminal to terminal) & town bus Terminal (bus stop to bus stop)
9. expressway tollgate = income
2. bus & metro & train & tram match line color(red, yellow, orange etc.)
3. add tram system
4. need a big airport (ex : domestic air(small), international air(big)) and big train station
5. underground intersection (3 layer or more)
6. gas power plant, parking garage
7. need more natural resources (iron, coal etc.)
8. add Intercity Bus Terminal (terminal to terminal) & town bus Terminal (bus stop to bus stop)
9. expressway tollgate = income
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