Along the Inland Sea west of Kobe on Honshu Island is the city of Akashi. A narrow strait (the Akashi Kaikyo) separates Akashi from Awaji Island. When the Japanese economy was booming in the 1980s, the government decided to build a highway system to connect quiet Shikoku with booming Honshu.
One Golden Week many years ago, I boarded a ferry from Tokyo to Shikoku Island. It took a day to reach Tokushima on the northeast side of Shikoku. Today, one can drive and its about 350 miles.
Honshu-Shikoku Bridges: Akashi-Kaikyo Bridge (2) by Mark Yashinsky is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 3.0 United States License.