First is free flow in which the density of traffic is low enough to allow vehicles to travel at the maximum speed allowed.
首先是畅通无阻,交通密度足够低,使得车辆能以最高时速行驶。
The Segway, which has a maximum speed of 12.5mph and can travel around 18 miles between charges, was unveiled by New Hampshire entrepreneur Dean Kamen 2001 and went on sale the following year.
“赛格威”的最高时速为12.5英里(合20公里),充电之后可行驶约18英里(合29公里),2001年,美国新罕布什尔州的企业家迪安·卡门将它公诸于众,第二年开始销售。
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