Using Maryland as a test case, federal researchers are finding they “can closely estimate the number of actual crashes on roads from the Waze data,” according to the Transportation Department. Busy roads with many Waze users provide the best results, while less crowded overnight hours aren’t as good.

https://www.washingtonpost.com/local/trafficandcommuting/federal-researchers-are-using-data-from-waze-and-maryland-to-try-to-predict-road-dangers/2018/07/07/bb40b51c-7ec9-11e8-bb6b-c1cb691f1402_story.html?noredirect=on