The Tokyo-based exhibition, organized by the Japan Motor Industrial Federation, is being dubbed "Vehicles of Character Across the World, Building Our Future." Organizers expect 120,000 visitors.
A total of 129 auto and auto parts manufacturers from seven countries -- Australia, France, Germany, Italy, Japan, Sweden and the United States -- are showing their products.
The latest motor show is the first to contain only commercial vehicles, after organizers decided last year to display passenger cars and commercial vehicles on alternate years.
Toyota Motor Corp. and its group companies Daihatsu Motor Co. and Hino Motors Ltd. are joining forces to show more than 60 vehicles featuring new hybrid adaptations and cutting-edge carbon dioxide reduction technology.
Some of the trucks the three companies are exhibiting feature advanced safety technology, including systems preventing vehicles from drifting out of their lanes, systems warning sleeping drivers and devices to warn drivers who are following other vehicles too closely.
Mitsubishi is showcasing hybrid engine technology for city buses, powered by an internal combustion engine and an electric motor. Nissan is focusing on hybrid midsize trucks that run on compressed natural gas. Isuzu is giving priority to natural gas-powered small trucks.