Demonstration Projects to Test Built Environment Changes: A Systematic Review

Context:Built environment interventions (pedestrian/bicycle infrastructure and enhanced access) mitigate barriers to physical activity by making the healthy choice the default choice. Demonstration projects (eg, temporary pedestrian lanes or sidewalks marked with tape) are used to test these interventions before making permanent changes. However, it is unknown whether demonstration projects lead to desired built environment changes.Objective:To systematically review the literature to determine outcomes and overall public health impacts of demonstration projects and whether they lead to permanent changes to the built environment.Design:Systematic review, conducted from March to September 2022 by searching PubMed and EBSCOhost for peer-reviewed literature and Google for gray (non-peer-reviewed) literature. Inclusion criteria were policy, systems, or environmental interventions; temporary implementation; and presence of evaluation data. Exclusion criteria were individual/interpersonal-level interventions, permanent implementation, and absence of evaluation data. Two authors coded for inclusion/exclusion and resolved discrepancies, coded a portion of included sources and resolved discrepancies, refined coding guide definitions, and coded remaining sources.Main Outcome Measures:Data were extracted based on the expanded RE-AIM (Reach, Effectiveness, Adoption, Implementation, Maintenance) framework, which incorporates constructs of the Implementation Outcomes Framework (acceptability, appropriateness, feasibility).Results:Gray (N = 23) and peer-reviewed (N = 1) sources describing unique demonstration projects (N = 31) met inclusion criteria. Projects tested built environment interventions including traffic calming measures, crosswalks, bike lanes, intersection design, and trails. Sources primarily reported effectiveness (typically improved safety), maintenance, acceptability, and appropriateness. Most sources did not report projects leading to permanent changes to the built environment.Conclusions:Based on inconsistent reporting of key outcomes (number of community members reached, changes to physical activity levels), overall impacts are unknown. Most demonstration projects captured community members' feedback, which was typically positive, but it is unknown whether feedback led to long-term changes. We recommend providing improved demonstration project guidance for practitioners to facilitate robust data collection, including suggested evaluation methods and tools.