Tōmei Expressway

Tōmei Expressway is a major national expressway in Japan, linking the Kantō region with the Chūbu region and the Kansai region. It runs from the capital Tokyo to the city of Nagoya, forming a critical segment of the Asian Highway Network and serving as a primary corridor for both passenger and freight transportation. Operated by the Central Nippon Expressway Company, it is one of the busiest and most economically significant highways in the nation.

Route description

The expressway originates at the Tokyo Interchange in the Setagaya ward, connecting directly to the Shuto Expressway system. Its alignment traverses southwestern Kanagawa Prefecture, passing near Yokohama and Atsugi, before entering Shizuoka Prefecture. The route then follows the Pacific coastline, offering views of Mount Fuji and Suruga Bay, and crosses the Tenryū River before entering Aichi Prefecture. It terminates at the Komaki Junction north of Nagoya, providing seamless connections to the Meishin Expressway and the Tōkai-Kanjō Expressway. Key engineering features include the lengthy Tanna Tunnel through the Shizuoka mountains and numerous large viaducts spanning the rugged terrain of the Japanese Alps foothills.

History

Planning for a high-speed road link between Tokyo and Nagoya began in the late 1950s, driven by Japan's rapid post-war economic growth. Construction commenced in 1962, with the first section opening between the Gotemba Interchange and the Fuji Interchange in 1968. The entire route was completed and fully opened to traffic in 1969, coinciding with the development of the nationwide Expressways of Japan network. It was initially managed by the Japan Highway Public Corporation before ownership and operations were transferred to the current operator following privatization in 2005. Subsequent decades have seen continuous upgrades, including widening projects and the implementation of advanced Intelligent transportation system technologies to manage its heavy traffic flow.

Major junctions

From the Tokyo terminus, major interchanges include the Yokohama-Aoba Interchange for National Route 246, the Ōiso Interchange for National Route 1, and the Numazu Interchange for the Fuji-Shizuoka Expressway. Critical junctions in Shizuoka Prefecture are the Shimizu Interchange serving the port of Shimizu, and the Shizuoka Interchange for access to central Shizuoka City. The Hamamatsu Interchange connects to National Route 152 and the Hamamatsu Bypass. Within Aichi Prefecture, the Toyokawa Interchange provides access to the Toyohashi area, while the final major junction before the terminus is the Nagoya Interchange, linking to the Nagoya Expressway network and the Isewangan Expressway.

Tolls and management

The expressway is managed and maintained by the Central Nippon Expressway Company, one of the regional companies established after the dissolution of the Japan Highway Public Corporation. Toll collection utilizes the nationwide Electronic Toll Collection system, with fees calculated based on distance traveled and vehicle classification. Revenue funds ongoing maintenance, seismic retrofitting projects, and congestion mitigation measures. The toll structure is periodically reviewed by the Ministry of Land, Infrastructure, Transport and Tourism, which oversees the national expressway policy. Special discount programs, such as those for frequent late-night users, are occasionally implemented to optimize traffic distribution.

Traffic and usage

It consistently ranks among the most heavily traveled expressways in Japan, with average daily traffic volumes exceeding 100,000 vehicles on key segments. It serves as an indispensable route for logistics and supply chains, connecting the major industrial zones of the Keihin Industrial Region and the Chūkyō Industrial Region. Traffic congestion is frequent, particularly during holiday periods like Golden Week and Obon, and on weekends near major interchanges like Gotemba. The parallel Shin-Tōmei Expressway, opened in stages beginning in 2012, was constructed to alleviate this chronic congestion and provide a bypass with higher seismic standards. Despite the new route, the original expressway remains a vital artery for regional and national commerce and mobility.

Category:Expressways in Japan Category:Transport in Kantō region Category:Transport in Chūbu region