Every morning I get loads of traffic reports for the M6 on my way to work, and whilst I know this is the whole point of Waze, could I suggest some road specific ones:
On the client: "Waze has noticed an increase in speed. You are going over 10mph. Are you sure you're on the M6?"
And perhaps the ability to report: "Traffic flowing freely!"
(Thought something light-hearted might make a change on here)