
    Given a binary string representing traffic conditions along a delivery route where '0' indicates a clear road segment and '1' indicates congestion, find the route segment with the greatest difference between clear and congested segments. This difference will help identify the most efficient sub-route for delivery vehicles to maximize their speed and minimize delays.
    

    
def find_length(string):
    """
    Given a binary string representing traffic conditions along a delivery route where '0' indicates a clear road segment and '1' indicates congestion, find the route segment with the greatest difference between clear and congested segments. This difference will help identify the most efficient sub-route for delivery vehicles to maximize their speed and minimize delays.
    

    """
def find_length(string):
    """
    Given a binary string representing traffic conditions along a delivery route where '0' indicates a clear road segment and '1' indicates congestion, find the route segment with the greatest difference between clear and congested segments. This difference will help identify the most efficient sub-route for delivery vehicles to maximize their speed and minimize delays.
    

    """
    n = len(string)
    current_sum = 0
    max_sum = 0
    for i in range(n):
        current_sum += 1 if string[i] == '0' else -1
        if current_sum < 0:
            current_sum = 0
        max_sum = max(current_sum, max_sum)
    return max_sum if max_sum else 0