The three roads that cross through the mountain weren't in the original plan, but the pathfinding forced my hand. Traffic isn't terrible, and I stay above 86% approval, so most sims are getting their needs met, which everyone knows is trying after 100-150K pop.
I am planning another city for the amusement park dlc (and maybe to tackle the expo center which has killed me in the past) that uses a more complex interchange, it works in my head so far...lol.