I was using Waze in horizontal mode last night - the speed limit and my current speed were displayed near the bottom of the screen in the middle horizontally. I noticed that when alerts such as Police ahead or Speed Camera in x feet were displayed the notification box covers key bits of the screen such as your current speed, the speed limit and your precise location.

I think either the UI needs to shift up when the alerts are displayed, or the alert box needs to be constrained to one side of the screen.

I did take a screen shot but it does not appear to be possible to attach that to this forum.