America Bogotá, Colombia in March 2021, implemented 84 kilometers of bike lanes to encourage social distancing during the COVID-19 pandemic. This expansion complemented the Ciclovía practice that originated in Colombia in 1974, where bicycles are given primary control of the streets. The resulting bicycle lane network is the largest of its kind in the world. Oceania The city of Melbourne, Australia developed Plan Melbourne 2017–2050 to accommodate growth and combat sprawl. The plan contains multiple elements of the 15-minute city concept, including new bike lanes and the construction of "20-minute neighborhoods". Implications The 15-minute city, with its emphasis on walkability and accessibility, has been put forward as a way to better serve groups of people that have historically been left out of planning, such as women, children, people with disabilities, and the elderly. Social infrastructure is also emphasized in order to maximize urban functions such as schools, parks, and complementary activities for residents. There is also a large focus on access to green space, which may promote positive environmental impacts such as increasing urban biodiversity and helping to protect the city from invasive species. Studies have found that increased access to green spaces can also have a positive impact on the mental and physical health of a city's inhabitants, reducing stress and negative emotions, increasing happiness, improving sleep, and promoting positive social interactions. Urban residents living near green spaces have also been found to exercise more, improving their physical and mental health. Limitations While the theory has many potential benefits, including reducing car dependence and promoting walkability in urban areas, it also has limitations. One limitation is the difficulty or impracticality of implementing the 15-minute city concept in established urban areas, where land use patterns and infrastructure are already in place. Additionally, the concept may not be feasible in areas with low population density or in low-income communities where transportation options are limited. Furthermore, when the concept is applied as a literal spatial analysis research tool, it then refers to the use of an isochrone to express the radius of an area considered local. Isochrones have a long history of utilization in transportation planning and are constructed primarily using two variables: time and speed. However, the reliance on population-wide conventions, such as gait speed, to estimate the buffer zones of accessible areas may not accurately reflect the mobility capabilities of specific population groups, like the elderly. This may result in