question: What feature added in 2007 facilitated bus travel by London ' passengers with hearing and vision impairments ?
answer: audio-visual announcements
turker_answer: The audio-visual announcements feature added in 2007 facilitated bus travel by London 's passengers with hearing and vision impairments .
rule-based: Audio-visual announcements feature added in 2007 facilitated bus travel by London ' passengers with hearing and vision impairments .