Under the Road Traffic Act, which vehicle may drive in lane 2 on an expressway with three lanes in each direction?

Answer: ④ Small or medium van

On an expressway with three lanes in each direction, lane 2 counts as the left lane, used by passenger cars and light, small and medium vans. Trucks, special vehicles and construction machines belong in the right lane. [Enforcement Rules of the Road Traffic Act, Appendix 9]