I wish I could offer some help for you, but that "service" has never worked for me on the 4 iPhones I've carried with me over the past 2 years - despite being enabled, toggled on/off/on, the locations showing up in my Settings. I carried 2 iPhone 5 and now carry 2 iPhone 6 handsets with me - not one peep or notification from the Traffic Conditions Notification item. I also have a cellular iPad Air - Traffic Conditions has never worked on that device. Sigh.
I've resorted to using a 3rd party app named "ETA" and setting my locations in that app. ETA works well, and gives me the option of "getting there" in either Google Maps or Apple Maps.