@openstreetmap/id-tagging-schema/data/presets/highway/turning_circle.json

The OpenStreetMap tagging model used by the iD editor

{
    "icon": "maki-circle",
    "geometry": [
        "vertex"
    ],
    "fields": [
        "turning_circle"
    ],
    "tags": {
        "highway": "turning_circle"
    },
    "terms": [
        "cul-de-sac"
    ],
    "name": "Turning Circle"
}