mapcomplete/assets/layers/left_right_style/left_right_style.json

{
    "id": "left_right_style",
    "description": "Special meta-style which will show one single line, either on the left or on the right depending on the id. This is used in the small popups with left_right roads",
    "source": {
        "osmTags": {
            "or": [
                "id=left",
                "id=right"
            ]
        }
    },
    "mapRendering": [
        {
            "location": [
                "point"
            ]
        },
        {}
    ]
}