A couple of years ago I worked on a project converting a T-junction to a 4-arm roundabout, adding access to the adjacent business park.
When the roundabout opened, I went on Google maps and requested they update their map data in this location, stating it was now a roundabout. After about a week the maps updated.
I assume they used GPS track data from vehicles using the junction and “created” the junction outline from there. We didn’t send them any maps or drawings.
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