The net effect of ridesourcing (RS) services on vehicle miles traveled (VMT) is ambiguous. With 2017 US National Household Travel Survey data, this study measures and compares the heterogeneous VMT effects of RS across population groups with various levels of household vehicle access and RS usage. A propensity score matching method was implemented to match RS non-users, occasional users, and frequent users based on observable sociodemographic traits. The results suggest that among drivers with household vehicle access, frequent RS users generate the least VMT, but occasional users actually generate more VMT. Those without a driver’s license or a household vehicle generate lower VMT while use more transit, and increasing RS use uniformly increases their overall VMT generation. We estimate that overall, RS generated a net increase of 7.8 million daily VMT in the US, compared with a counterfactual case in which all NHTS 2017 respondents were non-users of RS.

拼车（RS）服务对行驶的车辆行驶里程（VMT）的净影响是模棱两可的。利用2017年美国全国家庭出行调查数据，本研究测量并比较了RS在不同人群中具有不同水平的家用车辆出入和RS使用的VMT效果。实施了一种倾向得分匹配方法，以根据可观察到的社会人口统计学特征来匹配RS非用户，偶发用户和频繁用户。结果表明，在具有家用车辆通行权的驾驶员中，频繁的RS用户产生的VMT最少，而偶尔的用户实际上产生的VMT却更多。那些没有驾驶执照或家用车辆的人，在使用更多交通的同时产生较低的VMT，而增加RS的使用量则统一增加了他们的整体VMT产生。我们估计，总体而言，RS产生了7的净增长。