The University of Michigan Transportation Research Institute, Ann Arbor, MI 48109-2150, USA.
Inj Prev. 2009 Jun;15(3):205-6. doi: 10.1136/ip.2009.021964.
Road fatalities in the USA have recently decreased, and these reductions are greater than the corresponding reductions in the amount of driving. A multiple regression analysis was performed on monthly data from January 2007 through December 2008. The dependent variable was the number of road fatalities. The independent variables were distance driven, proportion of driving on rural roads, and the average price of unleaded gasoline as a proxy for the proportion of leisure driving. The results suggest that the larger-than-expected fall in road fatalities is partly a consequence of the disproportional decreases in rural driving (which is more risky than urban driving) and leisure driving (which is more risky than commuter driving).
美国的道路死亡人数最近有所下降，而且下降幅度大于驾驶量的相应下降幅度。对 2007 年 1 月至 2008 年 12 月的月度数据进行了多元回归分析。因变量是道路死亡人数。自变量是行驶距离、农村道路行驶比例以及无铅汽油的平均价格（代表休闲驾驶的比例）。结果表明，道路死亡人数出人意料的大幅下降部分是由于农村驾驶（比城市驾驶更危险）和休闲驾驶（比通勤驾驶更危险）不成比例减少的结果。
