The prescription is more about an ultimate target that is aligned with making mobility as efficient and low footprint as possible. For each mode we need to thi

The prescription is more about an ultimate target that is aligned with making mobility as efficient and low footprint as possible. For each mode we need to think: does it work if 10 bln people do this for centuries into the future? Even a mechanical bike has a non-trivial impact (its manufacture needs recyclable raw materials and energy, it needs paved paths etc). What you are suggesting is the least possible action in the current circumstances - which is fine very short term but not a full plan how to incentivise people. On the juicy question of bike vs walk I would say it depends on the weather :-)