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How to report problems on the road in Apple Maps or Google Maps
Help other drivers by reporting traffic problems via your phone.
These reports can be made from inside the mobile apps and on Apple CarPlay — though, at the time of writing, this couldn’t be done through Android Auto. This job can be done via voice commands through Siri or Google Assistant, so I’d encourage you to take that option and keep your eyes on the road — or even better, get a passenger to make the report. Pick from Crash, Mobile speed camera, Congestion, Roadworks, Lane closure, Stalled vehicle, or Object on road.
Or read this on The Verge