Para salir de una calle sin salida, ¿podrá efectuar marcha atrás más de 15 metros?

As a general rule, reversing is prohibited, except in the following cases: - When it is not possible to move forwards, turn or make a U-turn. In this case there is no limit on the reversing distance, and you may even enter a road junction if necessary. - As an additional manoeuvre when stopping, parking or joining the traffic. In this case you may not reverse more than 15 metres or enter a road junction. Reversing is prohibited on dual carriageways (autovías) and motorways (autopistas). In the case in the question, if we cannot make a U-turn, we may reverse the distance needed to get out of the dead-end street.