I was planning to spend 2 hours remaking the CentrePort interchange (just for fantasy). Stupid me, I totally misjudged how much space I actually needed so I ended up spending 4 hours on it instead. What pissed me off was that I didn't even have enough space to show all the ramps and to do the loops properly, and that it looked easy on the map but turned out harder on paper (once I needed to draw it).
Anyway, see what I did there?