In the Maps app on iPhone, you can report incidents or issues such as accidents, hazards, speed checks, road work, etc. There are a few ways on reporting incidents or Issues.
How to report an incident with Siri or CarPlay
Activate Siri by saying something like: "Hey Siri, report an accident" or "Hey Siri, there's something in the road."
If you're connected to CarPlay, you can tap the Report icon on the CarPlay display
How to report an incident while using turn-by-turn directions
Tap the gray arrow at the bottom of the screen
Tap Report an Incident
Tap Crash, Hazard, Speed Check, or Roadwork.
How to report an Issue or Inicident from the main Maps screen
Tap your image next to the search field
Select an option like Report Street Issue or Report Place Issue
Enter your information
Fill-in the information for the issue
When you're done, tap Send
Any incidents you report will be logged into the Maps app in the Reports menu under Incidents Reported.