A friendly nod or a wave of acknowledgement in response to an act of courtesy helps to create an atmosphere of goodwill and tolerance so necessary in modern trafficconditions.
对礼貌行为的友好点头或挥手感谢有助于创造带有善意的宽容氛围，这在现代交通条件下是非常必要的。
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Bellevue, a fast growing city, just east of Seattle, uses a system that is gaining popularity around the intersection signals that can adjust in real time to trafficconditions.