import csv


def load_sign_names(sign_names_file='../signnames.csv'):
  """
  Loads the CSV file containing traffic sign names.
  :param sign_names_file: Path to the sign-names CSV file.
  :return: A list containing sign-names, indexed by their label-class-number (known).
  """
  signs_list = []
  with open(sign_names_file, mode='r') as labels_file:
    reader = csv.reader(labels_file)
    next(reader, None)
    for sign in reader:
      signs_list.append(sign[1])
  return signs_list