I’ve been using this for the last month thanks to my friend Arie ( @EverythingN9 ). I wanted to bring this to you guys earlier, but the method to install the patch was rather involved for the everyday user. I’ve recently learned that N9 Quick Tweak (N9QT) has this option as part of it’s extensive list of tweaks and mods.
This is what has lead me to bring it to your attention. To install N9QT, you will need developer mode active (Settings > Security> Dev. Mode) and also third party installations (Settings>App.>Intall.). The file can be downloaded from here. Simply click the link on your N9, and open it from the Transfer UI.
I have made the assumption that the cities supported by Traffic are the same cities supported in Nokia Drive 3.0. The patch also enables Automatic/Day/Night colouring for Drive.