Comment by montag
It's not necessarily that complicated. My mom likes to complain that the person who designed her new stove never cooked in their life. I think the simpler explanation is that the person who designed that ramp arrangement didn't cycle very much and just wasn't empathetic to riders flying down the hill. In other words, they didn't care.
No, there are very specific regulations around infrastructure design, including what sorts of curves are safe in bike lanes at which speeds.
The reason that angle is that "sharp" (I don't think it's very sharp tbh) is because cyclists are explicitly not supposed to zoom up onto the sidewalk at 20 miles per hour. That's how you kill someone. If you're going too fast to make a 30-degree turn and avoid crashing, you're going too fast to be on the sidewalk. It's like complaining that the tight curves on a residential street make it unsafe to drive down it at 60mph.
Anyway, the influence of the auto lobby on urban infrastructure is really well-established: https://en.wikipedia.org/wiki/Car_dependency