Traffic only using one route

[NavalPorcupine]

Basically I have two routes to one of my residential zones, however the vast majority of cars are taking only one road (also the road going to commercial, so there's commercial traffic on that road too). They aren't going down the bigger road (which I made specifically for accessing the residential zone) and instead are all going down the commercial road; causing huge tailbacks and lots of congestion. Is there any way to fix this.

 

[Teldaril]

You could post a screenshot of the streets. Otherwise i can only guess.

-the bigger road is a too big detour
-the commercial road leads to industrial area and citizens tend to visit commercial in between work and residential, thus they have to take this road

 

[Promethian]

Use the new pathing check tool to see where everybody is going and coming from in the bottleneck. Remember that they are always just using the fastest route for them. So you can make multiple paths but they will still only use one. I frequently find I have to eliminate direct routes so traffic splits between more but longer routes.