Hi. Love Waze, but this idea is one of three that would take it from good to great for me...

Problem: The ability to respond to alerts (example for hazards: 'still there' or 'gone') disappears too quickly. Often (pot holes, for example) you need to be right on it before you can see it. Yet as soon as you are past it, the alert has disappeared and the user cannot respond. This contributes to the general problem of a high number of redundant (old) alerts because people don't have a chance to tell the app that the hazard is gone.

Possible Solutions:
1) Do not remove the alert as soon as you have passed the hazard. Allow the alert to stay on the screen for 10-15 seconds after passing the alert. The period that it remains on screen could be an option.
2) This could be enhanced further by leaving it on-screen for an extended period provided there is no further/additional immediate (immanent) alert that needs to be displayed.