The objectives of this research are to develop an improved understanding of the scope of the “last mile” problem in multimodal environments, explore what could be altered to change driver behavior and develop a toolkit of practical strategies.
Status: Research Underway
Impaired driving remains one of the most persistent causes of roadway deaths, and the growing mix of transportation options has made the “last mile” of impaired travel more complex. Even when people choose alternatives like rideshare, transit or micromobility, gaps in the system can still lead to impaired driving. Understanding these gaps is essential for reducing fatalities and improving safety across all modes.
This project will examine how people move through the transportation system when impaired and identify where breakdowns in the “last mile” lead to unsafe decisions. The research will explore how individuals transition between modes, what barriers they encounter and how system design, availability and cost influence their choices.
The project will analyze impaired mobility across a multimodal network that includes transit, rideshare, taxis, micromobility and personal vehicles. It will assess how well current systems support safe travel for people who should not drive and where improvements could reduce the likelihood of impaired driving.
The study will also review existing research and data sources referenced on the page, including national traffic safety data and behavioral research related to impaired driving and multimodal travel. These sources will help identify patterns, gaps and opportunities for intervention.
The project will produce guidance that helps states and local partners strengthen impaired‑driving countermeasures by improving multimodal options, closing last‑mile gaps and supporting safer choices for people who might otherwise drive impaired.
