In a world grappling with growing challenges such as air and noise pollution, traffic congestion, and increasing chronic illnesses due to unhealthy lifestyles, the need for intermodal active mobility and technological tools for its implementation has never been more pressing. Recognizing this urgency, the REACITIVY project, implemented in cities like Lecce (Italy) and Braga (Portugal), emerged as a beacon of change. The REACTIVITY project: A catalyst for change /In 2023, the REACTIVITY project nudged and promoted intermodality and active mobility by rewarding citizens with economic incentives to spend in local shops in Lecce (IT) and Braga (PT). At the same time, the project collected and monitored travel data to inform data-driven measures, policies, and investments. (....)