It's slightly unfair, but I read this as Waze deciding to route a bunch of cars down a narrow residential street to divert around a congested highway then going

It's slightly unfair, but I read this as Waze deciding to route a bunch of cars down a narrow residential street to divert around a congested highway then going "whoa, that's gonna be chaos! Watch the sparks fly!" More seriously, I hope they're using this accident data - particularly involving pedestrians - to avoid making routing decisions that increase their risk.