¿Cuál es la velocidad máxima en autopista para un coche que lleva un remolque ligero?

According to Article 48 of the General Traffic Regulations (RGC), the maximum speed allowed for a car towing a light trailer on a motorway (autopista) is 90 km/h. This rule applies because vehicles towing light trailers have a lower speed limit than cars without a trailer, which is 120 km/h on motorways. So the correct answer is 90 km/h, the specific limit for cars with light trailers on these roads.