
    Calculate the total length of security fencing needed to completely enclose a square bus terminal, given the length of one side of the terminal in meters. The perimeter calculation will be used to determine the total boundary length requiring pedestrian walkways and security monitoring systems for safe passenger access and bus traffic management.
    

    
def square_perimeter(a):
    """
    Calculate the total length of security fencing needed to completely enclose a square bus terminal, given the length of one side of the terminal in meters. The perimeter calculation will be used to determine the total boundary length requiring pedestrian walkways and security monitoring systems for safe passenger access and bus traffic management.
    

    """
def square_perimeter(a):
    """
    Calculate the total length of security fencing needed to completely enclose a square bus terminal, given the length of one side of the terminal in meters. The perimeter calculation will be used to determine the total boundary length requiring pedestrian walkways and security monitoring systems for safe passenger access and bus traffic management.
    

    """
    perimeter = 4 * a
    return perimeter