{# State 511 camera one-line subject. The `location` field already embeds the
   roadway (e.g. "I-84 Mountain Home"), so it stands alone. Fields from payload->data->data. #}
{% set d = (event.data.get('data') or {}).get('data') or {} %}
Camera: {{ d.get('location_description') or d.get('roadway_name') or ('#' ~ d.get('camera_id')) }}