Because it’s not called a siderun. It’s a sidewalk.
https://blossom.primal.net/62c61eb74e01a3920539ab95e485b30c8fa6a89e059d5687f09400aa3506cb7e.gif
https://relay.kyhou.duckdns.org:4438/b0e764a26674fea575807d157f3fc3dfcb547702b23b48cd64f1ae93ce3cb513.gif
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