Javascript animation ( Traffic Lights )

<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <style>
    body {
      overflow: hidden;
    }

    #lights {
      border: 5px solid;
      width: 90px;
      background-color: snow;
      border-radius: 8px;
      padding: 10px;
      position: absolute;
      left: -80px;
      top: -80px;
    }

    #box {
      position: relative;
      margin: 100px 200px;
      width: 100px;
      height: 400px;
      border-radius: 0 60px 0 0;
      border: 20px solid;
      border-left: none;
      border-bottom: none;
    }

    .color {
      margin: 5px 15px;
      border: 30px solid;
      border-radius: 50%;
      width: 0;
    }
  </style>
</head>

<body>

  <section id='box'>
    <section id='lights'>
      <div class='color'></div>
      <div class='color'></div>
      <div class='color'></div>
    </section>
  </section>

  <script>
    x = document.getElementsByClassName("color");
    colors = ["red", "orange", "green"];
    setTimeout(traffic = () => {
      x[2].style.border = "30px solid " + colors[2];
      setTimeout(() => {
        x[2].style.border = "30px solid";
        x[1].style.border = "30px solid " + colors[1];
        setTimeout(() => {
          x[1].style.border = "30px solid";
          x[0].style.border = "30px solid " + colors[0];
          setTimeout(() => {
            x[0].style.border = "30px solid";
            traffic()
          }, 3000);
        }, 3000);
      }, 3000);
    }, 3000);
  </script>
</body>
</html>