In suburban environments, the first- and last-mile connectivity challenge often hinders residents’ access to public transportation hubs, limiting their mobility and daily physical activity. Demand-responsive transport (DRT), characterized by its flexible routing and scheduling based on real-time passenger requests, has emerged as a promising solution to this issue. However, the intersection of DRT with conventional fixed-route public transit—such as buses and railways—and its potential to influence physical activity levels in suburban populations has remained poorly understood until now.
A groundbreaking study led by Associate Professor Haruka Kato at Osaka Metropolitan University delves deeply into this multifaceted topic. Situated within the framework of the smart city initiative in Senboku New Town, Osaka, this research employs a robust quasi-experimental methodology to assess how multimodal travel—specifically the combination of demand-responsive transport with traditional fixed-route buses—affects residents’ daily walking patterns. Using data collected from the HealthSmart-Senboku smartphone application, which captures detailed metrics on step counts and travel behaviors, the study provides a novel perspective on how integrated transport systems can promote incidental physical activity.
The empirical findings reveal a significant increase of approximately 1,730 steps per day among participants who combined DRT with fixed-route bus usage, outperforming those relying solely on demand-responsive services. This incremental increase in daily walking is not merely a statistical curiosity; it reflects meaningful behavioral changes in routine mobility patterns and has considerable implications for public health. The synergistic effect observed suggests that DRT, by lowering the barriers to accessing bus services, encourages more frequent multimodal trips that naturally incorporate additional walking segments.
The mechanistic underpinnings behind this phenomenon are particularly insightful. Contrary to conventional health promotion assumptions, few users reported health improvement as their primary motivation for shifting to multimodal transport. Instead, the data indicate that the introduction of DRT led to a marked increase in bus ridership during operation periods. This behavioral shift is attributed to the enhanced accessibility afforded by DRT, which facilitates residents’ journeys to bus pick-up points and necessitates transfers that contribute to an accumulation of walking steps throughout the day.
From a transport policy perspective, these results underscore a vital point: the integration of flexible transport services and fixed-route public transit can serve as a catalyst for enhancing population-level physical activity without relying on explicit health interventions. The augmented walking behavior results from improved transportation efficiency and convenience, providing a naturalistic pathway to better health outcomes. This cross-sectoral synergy offers a compelling model for urban planners and public transport authorities aiming to address mobility challenges and public health concurrently.
The research design’s reliance on quasi-experimental data analysis is crucial for isolating the causal relationship between multimodal transport usage and physical activity. By leveraging longitudinal step count data linked with travel logs, the study controls for confounders such as seasonal variability and individual mobility preferences. This rigorous approach strengthens the validity of the conclusion that the bus-DRT combination produces a measurable, positive impact on daily walking levels.
Importantly, the study contextualizes its findings within the broader landscape of smart city technologies and data-driven urban mobility solutions. The use of smartphone applications to gather high-resolution behavioral data exemplifies the transformative potential of digital tools in transportation research. Such technology-enhanced methodologies allow for the fine-grained detection of travel patterns and physical activity changes that traditional survey methods might overlook.
Beyond academic significance, the implications for public health policy are profound. Encouraging multimodal transport planning and infrastructure development can generate unanticipated health co-benefits. This reframing advocates for holistic mobility strategies that extend beyond reducing travel time or cost, positioning transport interventions as integral components of population health promotion efforts.
The research further highlights the operational advantages for bus operators and local governments. By integrating DRT services with existing transit networks, agencies might not only alleviate first- and last-mile challenges but also increase bus ridership and frequency of trips, leading to enhanced system efficiency and rider satisfaction. The cascade effect resulting in greater incidental walking is an additional societal gain that could justify investments in integrated transit ecosystems.
The article describing this work, published in the journal Transportation Research Interdisciplinary Perspectives, provides comprehensive insights into the quantitative relationship between multimodal transport and increased physical activity. It marks a significant advancement in understanding how emerging mobility models can influence health-related behaviors through infrastructure and service design.
In summary, this study delivers compelling evidence that the combination of demand-responsive transport with fixed-route buses acts as a powerful lever to increase daily walking steps among suburban residents. By mitigating access barriers and promoting the use of multiple transport modes, it offers a viable strategy for cities grappling with the dual goals of improving mobility and public health. This approach holds promise as a scalable, data-driven urban planning paradigm that aligns technological innovation with societal well-being.
Subject of Research: Not applicable
Article Title: Synergistic association between multimodal transport and demand-responsive transportation on daily walking steps: Quasi-experimental study in Senboku New-Town
News Publication Date: 19-Jan-2026
Web References: http://dx.doi.org/10.1016/j.trip.2026.101862
Image Credits: Osaka Metropolitan University
Keywords: Demand-responsive transport, public transit integration, physical activity, daily walking steps, multimodal travel, smart city, first- and last-mile connectivity, public health, suburban mobility
