The main thing I was missing from C:S1 is now in C:S2 (Route view)

https://www.paradoxinteractive.com/games/cities-skylines-ii/news/detailers-patch-2

I had been really wanting this for a long time. Finally it's here (as of 2 weeks ago), along with a host of other new road options, tools, performances upgrades and bugfixes.