Sustainability in transportation is critical for reducing carbon emissions and meeting climate goals. This paper introduces the Carbon Crest, a personalized carbon credit model designed to incentivize sustainable transport behaviour across Greater Manchester, UK. The model, inspired by the Verra VM0050 methodology, calculates carbon savings from changes in transportation modes, such as switching from private car use to public transport. A simulation framework, the Carbon Crest model, is proposed to track and measure these carbon savings, allowing for personalized carbon credit allocation based on individual commuting choices and regional residents’ travel patterns. The implemented model offers political decision makers a practical option to encourage sustainable mobility and contribute to regional climate targets. By leveraging blockchain technology and collaboration with local transport providers, the proposed framework enables a transparent, rewarding token-based approach to promote sustainable commuting behaviour changes.