Question: when were yellow lines introduced in the uk
[{'answer': '1960', 'provenance': [{'wikipedia_id': '51848072', 'title': 'Yellow line (road marking)', 'start_paragraph_id': 51, 'start_character': 197, 'end_paragraph_id': 51, 'end_character': 201, 'bleu_score': 1.0, 'section': 'Section::::Double yellow lines.:United Kingdom.:History.\n'}]}, {'provenance': [{'wikipedia_id': '51848072', 'title': 'Yellow line (road marking)', 'start_paragraph_id': 51, 'start_character': 0, 'end_paragraph_id': 51, 'end_character': 253, 'bleu_score': 0.9529077664391161, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 442356093643203142}, 'section': 'Section::::Double yellow lines.:United Kingdom.:History.\n'}]}]