
    Write a function to prioritize traffic intersections based on their congestion levels by sorting a list of (intersection_id, congestion_level) pairs according to the measured vehicles per minute at each intersection. The sorting should be performed using the congestion level values to help traffic management systems identify and address the most congested intersections first.
    

    
def subject_marks(subjectmarks):
    """
    Write a function to prioritize traffic intersections based on their congestion levels by sorting a list of (intersection_id, congestion_level) pairs according to the measured vehicles per minute at each intersection. The sorting should be performed using the congestion level values to help traffic management systems identify and address the most congested intersections first.
    

    """
def subject_marks(subjectmarks):
    """
    Write a function to prioritize traffic intersections based on their congestion levels by sorting a list of (intersection_id, congestion_level) pairs according to the measured vehicles per minute at each intersection. The sorting should be performed using the congestion level values to help traffic management systems identify and address the most congested intersections first.
    

    """
    subjectmarks.sort(key=lambda x: x[1])
    return subjectmarks