Shared micromobility services have undergone rapid growth in cities throughout the world, including expansions in bike sharing and e-scooter sharing services. Shared micromobility provides a potential complement to public transit by accommodating first and last-mile trips. I analyze detailed data on shared, dockless bikes and e-scooters from Seattle, Washington. I find micromobility vehicles cluster near Seattle's rail transit stations. During the study period, Seattle expanded its rail system into a new section of the city. I use the system expansion as a natural experiment to provide evidence of complementarity between shared micromobility and public transit. Using a differencein-difference strategy I find that, after a new light rail station opened, the flow of new micromobility vehicles increased significantly within a 5 min walking radius of the station. I provide causal evidence that local rail transit increases the use of dockless micromobility vehicles.

共享微型交通服务在世界各地的城市经历了快速增长，包括自行车共享和电动滑板车共享服务的扩展。共享微型交通通过容纳第一英里和最后一英里的出行，为公共交通提供了潜在的补充。我分析了来自华盛顿州西雅图的共享无桩自行车和电动滑板车的详细数据。我发现微型机动车辆聚集在西雅图的轨道交通站附近。在研究期间，西雅图将其铁路系统扩展到城市的一个新区域。我将系统扩展用作自然实验，以提供共享微型交通和公共交通之间互补性的证据。使用差异化策略，我发现在新的轻轨站开通后，在车站 5 分钟步行半径内，新的微型机动车辆的流量显着增加。我提供了因果证据，证明当地轨道交通增加了无桩微型机动车辆的使用。