By Leslie Vasquez
Making streets less stressful for walkers and bikers is strongly associated with more walking and biking, and new research from Maryland helps clarify where those effects are most pronounced. Building on prior research showing that lower-stress street environments are linked to more walking and biking, this study found that reducing traffic stress has the biggest impact for shorter trips and in places where alternatives to driving already exist.
The research analyzed level of traffic stress (LTS), which captures how comfortable a roadway feels based on factors such as vehicle speed, number of lanes, and protected bike lanes. While many existing travel models focus primarily on time, distance, and cost, this research directly incorporates trip-level LTS into a statewide mode choice model. By doing so, the authors demonstrate that accounting for traffic stress significantly improves the model’s ability to explain walking and biking behavior.
Beyond showing how traffic stress matters, the study also finds that its influence varies by context. Improvements in LTS are more strongly associated with increased walking and biking for trips ending in areas with lower car commuting rates, higher parking costs, and lower shares of industrial land use. In more car-dependent areas, or for longer trips, reductions in traffic stress alone are associated with smaller changes in travel behavior. These findings extend earlier research by showing that low-stress street design is most effective when supportive conditions are already in place.
These contextual patterns are reflected in the trip-level analysis itself. Using household travel survey data from Maryland, the researchers analyzed more than 37,000 trips across driving, walking, biking, and transit. The results show that higher traffic stress is significantly associated with a lower likelihood of choosing walking, biking, or transit. Sensitivity analyses further indicate that improvements in LTS are associated with increases in walking and biking mode share. Although biking represents a relatively small portion of total trips in the dataset, reductions in traffic stress were linked to meaningful increases in bike use.
Together, these results highlight the importance of treating traffic stress as a core factor in travel behavior analysis and transportation planning. The authors point to complete streets strategies, such as protected bike lanes, pedestrian-focused signal timing, wider sidewalks, crossings, and traffic calming, as practical ways to reduce LTS. They also emphasize that LTS improvements are likely to be most effective when strategically prioritized and paired with supportive policies, such as parking management, in places where walking, biking, and transit already have strong potential.
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