31. Utilización de los carriles, fuera de poblado, en calzadas con más de un carril por sentido

Article 31. Use of Lanes, Outside Built-Up Areas, on Roads with More Than One Lane in the Same Direction of Travel. 1. The driver of a car or a special vehicle with a maximum authorized mass exceeding 3,500 kilograms shall travel on the roadway and not on the shoulder, except in emergencies. Furthermore, outside built-up areas, on roads with more than one lane for their direction of travel, they shall normally travel in the rightmost lane, although they may use the other lanes in that direction when traffic or road conditions so advise, provided they do not impede the progress of another vehicle behind them. 2. When one of these roads has three or more lanes in the direction of travel, drivers of trucks or vans with a maximum authorized mass exceeding 3,500 kilograms, drivers of special vehicles that are not required to travel on the shoulder and drivers of vehicle combinations of more than seven meters in length will normally travel on the rightmost lane, and may use the next one under the same conditions and circumstances mentioned in the previous section.