The National Cancer Institute (NCI) awarded a $231,710 Project Grant under the Cancer Cause and Prevention Research (CFDA 93.393) program to Arizona State University's Division, doing business as Orspa, to develop and validate machine learning algorithms for assessing microscale pedestrian environment features (PEFs) in rural areas. The project aims to: 1) further validate existing deep learning classifiers to assess 9 microscale PEFs (e.g., sidewalks, crosswalks, lighting) in rural settings, 2) test the relationship between rural microscale PEFs and physical activity among middle to older age adults, and 3) identify disparities in rural microscale PEFs by income, race, ethnicity, and geography across the U.S. The validated PEF assessment tool is expected to inform larger-scale research and interventions addressing physical inactivity and cancer-related health disparities in diverse rural communities.