Question: which part of the uk do traffic officers operate
[{'answer': 'West Midlands', 'provenance': [{'wikipedia_id': '22552632', 'title': 'Highways England Traffic Officers', 'start_paragraph_id': 2, 'start_character': 99, 'end_paragraph_id': 2, 'end_character': 112, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '22552632', 'title': 'Highways England Traffic Officers', 'start_paragraph_id': 2, 'start_character': 0, 'end_paragraph_id': 2, 'end_character': 359, 'bleu_score': 0.6882457259988951, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 15343849897650477406}, 'section': 'Section::::Abstract.'}]}]