I want to know the answer to the following question:
In what year did the NBS revisit the DOT's 1975 study and find traffic fatalities unaffected?
All the background I'm provided with is that "In 1975 the US DOT conservatively identified a 0.7% reduction in traffic fatalities during DST, and estimated the real reduction at 1.5% to 2%, but the 1976 NBS review of the DOT study found no differences in traffic fatalities.". Is that enough to answer the question?