I don't think, building bike lanes in dense cities is hard. A bit of Jersey wall, some signs, single lane traffic for cars. You save a lot of pothole repairs soon!
Which may be appropriate for an exceptional piece of infrastructure capable of hosting heavy vehicles as well as cars.
If you are going to compare "infrastructure" then you have to compare everything, including how many people benefit - everyone who shops at a supermarket benefits from the road system even if they own no vehicle.
