
    Given a list of tuples containing pairs of historical and current travel times between delivery points, determine the largest change in travel duration across all routes to identify the most significant traffic pattern shift. Each tuple contains the previous travel time and current travel time in minutes for the same route, and the function should return the maximum difference found between any such pair of measurements.
    

    
def max_difference(test_list):
    """
    Given a list of tuples containing pairs of historical and current travel times between delivery points, determine the largest change in travel duration across all routes to identify the most significant traffic pattern shift. Each tuple contains the previous travel time and current travel time in minutes for the same route, and the function should return the maximum difference found between any such pair of measurements.
    

    """
def max_difference(test_list):
    """
    Given a list of tuples containing pairs of historical and current travel times between delivery points, determine the largest change in travel duration across all routes to identify the most significant traffic pattern shift. Each tuple contains the previous travel time and current travel time in minutes for the same route, and the function should return the maximum difference found between any such pair of measurements.
    

    """
    temp = [abs(b - a) for (a, b) in test_list]
    res = max(temp)
    return res