question: In what year did the NBS revisit the DOT 's 1975 study and find traffic fatalities unaffected ?
answer: 1976
turker_answer: In 1776 , the NBS revisited the DOT 's 1975 study and found traffic fatalities unaffected .
rule-based: The NBS revisited the DOT 's 1975 study and found traffic fatalities unaffected in 1976 .