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。
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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