Under the Act on the Promotion of Development and Distribution of Environment-Friendly Vehicles, which vehicle must NOT park in a parking space reserved for eco-friendly vehicles?

Answer: ② Solar-powered vehicle

Only electric vehicles, hybrid vehicles and hydrogen fuel cell electric vehicles may park in eco-friendly vehicle spaces. A solar-powered vehicle is not one of the listed types, so it must not park there. [Act on the Promotion of Development and Distribution of Environment-Friendly Vehicles, Art. 11-2(7)]