这项技术已经在飞机上使用了50年，而且已经在一些车辆上使用（大部分只有有限的信息，如车速显示）。
This technology has been available in aircraft for 50 years and is already available in a few vehicles (mostly with limited information such as speed displayed).
在一些大型车辆禁止通行的大都市，它也可以畅通无阻。
It is also allowed in certain metropolitan areas that larger cars are not.
但是，在一些沿海地区，一些小的道路仍然受阻或者只能承受轻便的车辆通过。
But some minor roads in coastal areas are still blocked or can be used only by light vehicles.
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