Retrieves the road closed information for the incident/incidents
        from the output response

        Returns:
            road_closed(namedtuple): List of named tuples of road closed
            information for the incident/incidents

def road_closed(self):
        """Retrieves the road closed information for the incident/incidents
        from the output response

        Returns:
            road_closed(namedtuple): List of named tuples of road closed
            information for the incident/incidents
        """
        resource_list = self.traffic_incident()
        road_closed = namedtuple('road_closed', 'road_closed')
        if len(resource_list) == 1 and resource_list[0] is None:
            return None
        else:
            try:
                return [road_closed(resource['roadClosed'])
                        for resource in resource_list]
            except (KeyError, TypeError):
                return [road_closed(resource['RoadClosed'])
                        for resource in resource_list]