Rationale: Policy makers across the world, including Saudi Arabia, are employing various supply-and demand-side policies to reduce greenhouse gas emissions from light-duty vehicles and promote clean vehicle adoption, such as the fuel economy standards, greenhouse gas emission standards, zero emission vehicle mandate, financial and non-financial incentives. This project aims to explore the potential impact and cost-effectiveness of these supply-and demand-side policies on adoption of fuel-efficient vehicles and associated energy demand.