@openstreetmap/id-tagging-schema/data/fields/railway/turnout_side.json

The OpenStreetMap tagging model used by the iD editor

{
    "key": "railway:turnout_side",
    "type": "combo",
    "label": "Turnout Side",
    "strings": {
        "options": {
            "left": "Left",
            "right": "Right"
        }
    },
    "autoSuggestions": false,
    "customValues": true
}