Question: when did the third brake light become law
[{'answer': '1986', 'provenance': [{'wikipedia_id': '2357908', 'title': 'Automotive lighting', 'start_paragraph_id': 85, 'start_character': 38, 'end_paragraph_id': 85, 'end_character': 42, 'bleu_score': 1.0, 'section': 'Section::::Conspicuity, signal and identification lights.:Rear.:Stop lamps (brake lights).:Centre high mount stop lamp (CHMSL).\n'}]}, {'provenance': [{'wikipedia_id': '2357908', 'title': 'Automotive lighting', 'start_paragraph_id': 85, 'start_character': 0, 'end_paragraph_id': 85, 'end_character': 602, 'bleu_score': 0.9579655027162681, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 14504197038212533909}, 'section': 'Section::::Conspicuity, signal and identification lights.:Rear.:Stop lamps (brake lights).:Centre high mount stop lamp (CHMSL).\n'}]}]