A **passenger car with a light trailer** can drive in a lane open in the opposite direction to the usual one **when roadworks are being carried out on the roadway**. This is because, in roadwork situations, all vehicles authorized to drive on a road under construction are allowed to use these lanes.


However, when lanes in the opposite direction are opened to improve traffic flow, only **motorcycles and passenger cars** without trailers can use them. In these situations, the aim is to reduce traffic jams by allowing more vehicles to travel in the same direction, but with specific restrictions on which types of vehicles can use these lanes.

Therefore, a passenger car with a light trailer can only use these lanes in the context of roadworks, not for traffic flow reasons.