But where to put it? Access ramps have to be shallow and thus take up considerable street space. Ramps are as long as those for an elevated road; they're just narrower. Long spirals and zig-zags are a pain; few people use those things unless there's no alternative, such as a freeway overcrossing.
China has a 7km elevated bikeway.[1] But they already had an elevated busway on that route; the bikeway just hangs underneath.
Los Angeles had a 9 mile elevated bicycle tollway in 1900, but it was unprofitable and was torn down.
Market St. in SF has an "elevated bikeway" test, but they mean elevation to curb height, not a few meters up.
There are context-specific problems to be solved in every city, but the idea is that an innovative design process can help, or should at least be considered. It's not reasonable to expect an instant universal solution (that kind of universal modular solution, by the way, is what "infrastructure" often does end up looking like). This article is arguing for a cultural change; it's about fresh thinking and working with the particularity of local spatial conditions in a creative way. It takes a lot of determination.
China has a 7km elevated bikeway.[1] But they already had an elevated busway on that route; the bikeway just hangs underneath. Los Angeles had a 9 mile elevated bicycle tollway in 1900, but it was unprofitable and was torn down.
Market St. in SF has an "elevated bikeway" test, but they mean elevation to curb height, not a few meters up.
[1] https://www.weforum.org/agenda/2017/07/china-has-just-built-...