Test learners' ability to apply cost–benefit and environmental impact analysis to choose the optimal daily commute among car, public transit, bike, and walking. Tasks include estimating monetary costs (fuel, fares, maintenance), travel time and reliability, health and indirect benefits, greenhouse gas and local emissions impacts, infrastructure/accessibility constraints, and trade-offs across scenarios (distance, weather, policy incentives, disability). Require quantitative comparisons, sensitivity to assumptions, and a justified recommendation with clear explanation of method and limitations.