
    Write a function that determines if there is any overlap between the currently active bus routes and the system-recommended routes based on real-time traffic conditions. The function should compare two lists - one containing active route IDs and another containing recommended route IDs - and return true if at least one route appears in both lists. This overlap check helps identify which existing routes align with the system's optimization recommendations.
    

    
def common_element(list1, list2):
    """
    Write a function that determines if there is any overlap between the currently active bus routes and the system-recommended routes based on real-time traffic conditions. The function should compare two lists - one containing active route IDs and another containing recommended route IDs - and return true if at least one route appears in both lists. This overlap check helps identify which existing routes align with the system's optimization recommendations.
    

    """
def common_element(list1, list2):
    """
    Write a function that determines if there is any overlap between the currently active bus routes and the system-recommended routes based on real-time traffic conditions. The function should compare two lists - one containing active route IDs and another containing recommended route IDs - and return true if at least one route appears in both lists. This overlap check helps identify which existing routes align with the system's optimization recommendations.
    

    """
    result = False
    for x in list1:
        for y in list2:
            if x == y:
                result = True
                return result