test/bin/make_lanes.php

<?php
$template = file_get_contents('lanes.template');
$sign = rtrim(file_get_contents('lanes-sign.template'));

$sign_template = array();
for ($i = 1; $i <= 12; $i++) {
  $sign_template[] = strtr($sign, array('@' => $i));
}
$sign_template = implode(",\n", $sign_template);

$template = strtr($template, array('SIGN' => $sign_template));

file_put_contents('lanes.json', $template);