Evaluation on urban traffic safety level is an important stage of the whole traffic management, which plays a role as promoting traffic level by appraising.

道路交通安全水平评价是道路交通管理全过程中的一个重要环节，能够起到以评促建的作用。

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Transport for London (TfL) is currently trialling eye-level traffic lights for cyclists and "Dutch-style" roundabouts.

BBC: 'Crossrail for bikes' set for London

It doesn't, for example, show you the level of traffic on a particular road at the time of a crash.

BBC: Crash: About the road fatality data

In 1979 3M revamped its technology--sold under the Opticom brand--to allow it to recognize two different priority levels: a high level for emergency vehicles, which could force traffic lights to change immediately and a lower level for transit vehicles, which could hold off changing the light entirely if changing the light to green would snarl traffic.

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