Eleven of those with responsibilities for the project stand accused.

Six people died and three were injured when a 60m-long by 12m-wide section of the multi-span concrete viaduct collapsed some 50m.

Speaking the day befor the trial began, the regional workers confederation CCOO de Andalucía called for prison sentences for those responsible. It said that although the victims' families have received compensation, its goal was to clarify what happened so that lessons could be learned for the future and any criminal liability would be determined.