
    In a delivery fleet management system, given a binary route status n where each bit represents a route segment's availability (1 for available, 0 for blocked), develop a function to identify and activate the leftmost inactive route segment. The function should modify the route status by changing the leftmost 0 to 1, effectively adding the next available alternative route segment to the delivery truck's options.
    

    
def set_left_most_unset_bit(n):
    """
    In a delivery fleet management system, given a binary route status n where each bit represents a route segment's availability (1 for available, 0 for blocked), develop a function to identify and activate the leftmost inactive route segment. The function should modify the route status by changing the leftmost 0 to 1, effectively adding the next available alternative route segment to the delivery truck's options.
    

    """
def set_left_most_unset_bit(n):
    """
    In a delivery fleet management system, given a binary route status n where each bit represents a route segment's availability (1 for available, 0 for blocked), develop a function to identify and activate the leftmost inactive route segment. The function should modify the route status by changing the leftmost 0 to 1, effectively adding the next available alternative route segment to the delivery truck's options.
    

    """
    if not n & n + 1:
        return n
    (pos, temp, count) = (0, n, 0)
    while temp:
        if not temp & 1:
            pos = count
        count += 1
        temp >>= 1
    return n | 1 << pos