Norway’s roads authority is working on ways of making driving safer by using live traffic information provided by the road surface itself.

A pilot intelligent transport system project in the high north, where roads are covered with snow and ice in winter, is testing a novel way of using optical-fiber cables. Instead of carrying data, the fiber works as a listening device to map passing traffic.

The Public Road Administration’s (PRA) basic idea is that the light signal in the fiber is altered slightly by vibrations from passing vehicles.
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