Waze should alert the user if traffic or an accident causes it to re-route you, rather than just doing it.
Alerting the user that a better route is available due to an accident or traffic, rather than just re-routing, would leave the user better informed. I eneded up in a 40 min traffic jam due to an accident because Waze tried to divert me off my usual route with no explanation. My old Garmins/TomToms used to do this.
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