Mountain road
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A mountain road is a road that runs through the mountains . If one or more mountain saddles are crossed in the course of the route , the phrase pass road applies . Mountain roads are usually characterized by a winding route with an increased longitudinal gradient . On particularly steep inclines, mountain roads are laid out as serpentines .
The topography often allows only a narrow street width and in some cases makes it necessary to build art structures such as tunnels and bridges . The winter climate can limit the passability of mountain roads or even require them to be temporarily closed. To the rockfall risk to decrease, appropriate protective nets or galleries created.