Why is there an assumption that the tunnels have to be for cars? Create tunnels for bicycles instead:
- Tunnels don´t need to be nearly as big, and would still have higher capacity
- The friction of ¨I won´t ride a bike because it´s dangerous¨ is reduced or eliminated
- Weather as a factor in commuting by bike is eliminated
- Like a railway grade, you can basically eliminate any significant elevation ascents/descents
