I have sort of same question.
I was very frustrated on my way home. I checked the road ahead of me (the usual route I always take) and there were numerous reports that its packed/slow/standstil so I took back-roads to avoid it.
On the way beside the road, which was reported, I saw it's free of traffic completely. I wasted around 20 min later just to get back on the usual road
So my questions would be:
1) Is it possible to (or maybe would be good to implement it) Press on Reported Traffic Warning and Choose between: Road is calm, not a StandStill and etc? Might be a good idea, because what I did was not even noticeable, I Pressed on Report and Wrote on the Comment section: road is clear of traffic. But that didn't show up next time I pressed on Report, only thing I saw was a little Green Pop-up on the Icon.
2) How long Traffic Reports stays on the screen? I saw mine all the time while I was driving home, what took me around 1 hour