Are Italian cities already 15-minute? Presenting the Next Proximity Index: A novel and scalable way to measure it, based on open data

• https://www.sciencedirect.com/science/article/pii/S2667091723000134
• Beatrice Olivari, Piergiorgio Cipriano, Maurizio Napolitano, Luca Giovannini

15 minute city

Suggests “NExt poXimity Index (NEXI)”. The measure uses OpenStreetMap to measure a given cell in a city have the amenities within x-minute walking distance.