On the highway, trailers are not allowed in the leftmost lane.
Tips
usage
挂 means 'to hang/hook on'. A 挂车 is any unpowered vehicle towed by another — semitrailers, RV trailers, equipment trailers. Compare 半挂车 (bànguàchē, semi-trailer) and 全挂车 (quánguàchē, full trailer). The towing tractor unit is 牵引车 (qiānyǐnchē).
