OP here. I've posted a bunch of photos/videos on Twitter: <a href="https://twitter.com/cheeaun/status/1010542298810085376" rel="nofollow">https://twitter.com/cheeaun/status/1010542298810085376</a><p>Basically my goal is to render <i>all</i> bus routes on a map. But unlike train routes, they overlap wayyy too much. Instead of limiting the space to X & Y, I thought why not go Z index (up).<p>Data from Land Transport Authority of Singapore. Map is powered by Mapbox GL JS.