The route is constructed to freeway standards over its entire length.

The route was constructed in 1979, after a sixteen-year delay.

In 1931 the current routes 23 and 9H were constructed, diverting traffic away from the bridge.

Following the upgrade of the A92 it is unlikely this route will be constructed.

The route was constructed in 1958 but signed in 1957.

If the entire route was constructed to Shinkansen standard, travel time would be 41 minutes.

This route was never constructed, but the designation has not been cancelled.

This route isn't constructed yet, but the designation has not been cancelled.

The route was constructed and opened to traffic in two stages during the 1980s.

Although only three routes were constructed, they have never closed and are still running.