Kanmonkyo

Kanmonkyo is a bridge that connects between Kiyakushu and Honshu - two of the four main islands of Japan. It is ranked as the 48th largest suspension bridge in the world, and it is 1068 meters long. 

The bridge opened in 1973, and the bridge has been crossed by nearly 29,000 vehicles daily in 2005. That number doubled to over 61,000 vehicles in 2010, due to the Kanmon tunnel being under construction, which left many passengers to have to cross over the bridge to get to Honshu (the tunnel from my third post). 

The Kanmon Tunnel has been in operation for 50 years, and its construction began over 70 years ago, and it has issues with deterioration. For that reason, the tunnel often needs to undergo large scale maintenance. When the tunnel is under maintenance, tunnel commuters are re-routed to the Kanmon Bridge, without having to pay an extra charge. On the other hand, when the bridge cannot be used because of adverse weather conditions such as a Typhoon, bridge commuters are re-routed to the tunnel, also without any extra fees.