Right now, the Missouri Highway Patrol has logged 936 traffic fatalities so far this year, compared to 990 at the same time last year. (And 2007 was another year where there was a big decline.) Assuming we don't have a particularly bad New Year's Eve, traffic deaths will have dropped about 5 percent.
Which makes sense when you consider the huge drop in miles driven this year. This summer, when gas prices spiked, a lot of drivers cut back on their traveling, which corresponds to a lower fatality count.