¿Está permitido realizar un cambio de sentido en esta intersección?

As a general rule, making a U-turn is prohibited where overtaking is prohibited, unless it is expressly allowed by the corresponding sign. At junctions and near them overtaking is prohibited, unless you have right of way and it is properly signalled. In this case, right of way is given by the green traffic light, so you may overtake or make a U-turn, always carefully and without putting any road user in danger. At roundabouts, although they are a special type of junction, making a U-turn is allowed.