
    Calculate the total length of safety barriers needed to fully enclose a square maintenance bay where transit vehicles undergo inspection, given the length of one side of the bay in meters. The barriers must form a continuous perimeter around all four sides of the maintenance area to ensure worker safety during vehicle repairs and inspections.
    

    
def square_perimeter(a):
    """
    Calculate the total length of safety barriers needed to fully enclose a square maintenance bay where transit vehicles undergo inspection, given the length of one side of the bay in meters. The barriers must form a continuous perimeter around all four sides of the maintenance area to ensure worker safety during vehicle repairs and inspections.
    

    """
def square_perimeter(a):
    """
    Calculate the total length of safety barriers needed to fully enclose a square maintenance bay where transit vehicles undergo inspection, given the length of one side of the bay in meters. The barriers must form a continuous perimeter around all four sides of the maintenance area to ensure worker safety during vehicle repairs and inspections.
    

    """
    perimeter = 4 * a
    return perimeter