无交通管制的空域被定为等级 F，而低于海拔5490米、不在机场附近的管制空域是等级 E。
Uncontrolled airspace is designated Class F, while controlled airspace below 5,490m above sea level and not in the vicinity of an airport is Class E.
在交通环境中以城市主干道、混合式道路和无交通控制道路多发。
Most traffic accidents occurred on vital communications line, roadways without footpath and roadways without traffic control.
Vespignani说，“那应该会帮助我们设计出更优的能源分布系统，为无交通城市做出更好的规划，以及更好地分配全球的资源。”
And that should help us design better energy distribution systems, plan for traffic-free cities and manage the deployment of the world's resources.
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