This can reduce traffic and processing overhead considerably when the message volume is high.

当消息量很大时，这可以大大减少通信量和处理开销。

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The presence or absence of freight traffic, the volume of freight traffic, and the nature of freight operations (e.g., overhead vs. local switching).

货车流量存在与否、货车流量的大小、货车运行的性质（如，高架道口或平交道口）。

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A small transport overhead (the fixed-length header is just 2 bytes), and protocol exchanges minimised to reduce network traffic.

小型传输，开销很小(固定长度的头部是2字节)，协议交换最小化，以降低网络流量。

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The plans for the motorway near Sheffield include variable mandatory speed limits displayed on overhead and verge-mounted signs to smooth traffic flow and reduce congestion said the agency.

BBC: M1 managed motorway ?150m plans on public view

Light pollution can come from TV and computer screens, other electronic displays and ambient sources such as streetlights, passing traffic and neighboring buildings, in addition to overhead lighting within the home.

CNN: Unplug! Too much light at night may lead to depression

No traffic moved along the nearby motorway, and not a single aircraft flew overhead toward London Airport.

NEWYORKER: The Autobiography of J.G.B.