1. concrete answer
2. Impose high taxes
3. Impose high charges
4. Tax
5. high gas prices
6. Charge them for using
7. Make them more expensive
8. Use public transport ims
9. Impose taxes on cars
10. Impose high charges
11. Charge them for using
12. Charge them for using
13. Impose taxes in cars
14. Use public transport ims
15. Use public transport ims
16. Reduce half of car supply
17. Cheaper public transport
18. Use public transport
19. Impose high charges/taxes
20. Cheaper public transport
21. Cheaper public transport
22. advertise public transpor
23. car
24. Cheaper public transport
25. Cheaper public transport
26. impose pricey tunnel toll
27. Cheaper public transport
28. Raise license fees
29. Cheaper public transport
30. Impose taxes
31. Ban private cars
32. Use mtr instead
33. Provide public transport
34. Reduce human population
35. Cheaper public transport
36. Cheaper public transport
37. Higher petrol taxes
38. Cheaper public transport
39. Cheaper public transport
40. Cheaper public transport
41. Create aliens andbfjrjshd