Japan launched its first Five-Year Road Improvement Program to rebuild and modernize roads after World War II. This marked the start of sustained national investment in higher-capacity roads to support rapid economic growth and rising vehicle use.
The Japan Highway Public Corporation (JH) was created to plan, build, operate, and maintain toll roads and expressways. Establishing a dedicated national organization helped Japan move from general road improvement to large-scale expressway construction.
Work started on Tokyo’s urban expressway system to address worsening congestion in the capital. This was an early step toward integrating city expressways with the growing national expressway network.
Tokyo opened the first 4.5 km section of what became the Shuto Expressway network. The opening demonstrated how elevated, access-controlled roads could move traffic through dense urban areas where widening surface streets was difficult.
A first section of the Meishin Expressway opened, widely treated as Japan’s first major intercity expressway. It provided a model for modern expressway design (controlled access, grade separations, tolling) that would be expanded nationwide.
During the early 1960s, Tokyo added key urban expressway links and improved access to major facilities. These projects supported the 1964 Tokyo Olympics and established a long-term strategy of using urban expressways to manage metropolitan traffic.
The World Bank approved a large loan to support construction of the Tokyo–Kobe Expressway corridor (the Tōmei and Meishin routes). International financing helped Japan accelerate completion of a high-capacity spine linking its largest industrial and population centers.
The Chūō Expressway opened its first segment west of central Tokyo, starting a major new inland route. Adding a second trunk corridor reduced dependence on a single coastal axis and improved regional connectivity beyond the Tōkaidō corridor.
The Tōmei Expressway began opening in stages, building the high-speed link between Tokyo and Nagoya. These openings set up the final connection with the Meishin Expressway, creating a continuous intercity corridor.
The Tōmei Expressway was completed by 1969, forming a continuous Tokyo–Nagoya–Kobe expressway corridor when combined with the Meishin. This corridor became a core freight and passenger route and a backbone for later national highway expansion.
The first section of what became the Higashi-Meihan Expressway opened, adding another high-standard route in the Nagoya–Kansai travel market. It helped distribute traffic across multiple corridors rather than relying only on the earliest expressway spine.
By the early 1970s, Tokyo’s Metropolitan Expressway network pushed toward completing its originally planned core length while extending radial routes. New links connected the urban network to national expressways such as the Tōmei and Chūō, strengthening metro-to-national integration.
A major junction connection linked the Shuto Expressway’s Route 3 (Shibuya Line) directly to the Tōmei Expressway. This improved long-distance access to central Tokyo and showed how interchange design could tie city expressways into national trunk highways.
By the mid-1980s, Japan’s road development had shifted from early expressway creation to managing and extending a large, heavily used network. This period set the stage for later policies focused on congestion relief, maintenance, and adding parallel routes to key corridors.
Japan's national highway expansion and Shuto Expressway integration (1950–1985)