1.  hamper traffic
2.  obstruct the traffic

• 1. 阻碍交通: impede traffic | Obstruction to traffic | hold up the traffic
• 2. 交通阻碍: be held up in traffic

• 1.“这一次，是我们正在阻碍交通。”他高兴地说。
  "For once, we are the ones who are blocking the traffic," he says delightedly.
  dict.yoduao.com
• 2.它加速很轻快，不会阻碍交通。
  It accelerates briskly enough not to hold up traffic.
  dict.yoduao.com
• 3.如果你把车停在街上，它将会阻碍交通。
  If you park the car in the street, it'll hold up the traffic.
  dict.yoduao.com

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