@openstreetmap/id-tagging-schema/data/fields/spacing.json

The OpenStreetMap tagging model used by the iD editor

{
    "key": "spacing",
    "type": "number",
    "label": "Distance Between Barriers (Meters)",
    "snake_case": false,
    "prerequisiteTag": {
        "key": "cycle_barrier",
        "valueNot": "single"
    }
}