Snow clearing in Norway - spectacular drone footage

Jo William Boman found that the Norwegian Public Road Administration was going to plow Trollstigen, the famous Norwegian serpentine mountain road. He readied his drone - and the results are spectacular.
SFOGuysays...

OK, dumb question; how do you know where the edges of the road are? Non-military spec GPS can't be accurate for this application to within 6 inches...

So---how do they know?

Zawashsays...

Top grade GPS. They have access.

SFOGuysaid:

OK, dumb question; how do you know where the edges of the road are? Non-military spec GPS can't be accurate for this application to within 6 inches...

So---how do they know?

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