Correct answer: That the large vehicle will probably move toward the left before turning.

If a truck or bus is too large to turn right while keeping close to the edge, it may turn another way, taking the necessary precautions to avoid creating danger. That is why it will probably swing out to the left before turning to give itself room. If you are behind it, expect this, wait until it finishes, and do not move into the gap it leaves on its right.

Real Decreto 1428/2003, de 21 de noviembre, por el que se aprueba el Reglamento General de Circulación · Consejos para circular cerca de vehículos pesados