Toyota Motor Corp. and Mazda Motor Corp. announced plans for a long-term partnership that would go deeper than existing project-based ties as the industry faces escalating costs and technical challenges, including environmental and safety requirements.

Toyota, Japan’s largest automaker, and second-tier producer Mazda said they would set up a joint committee that would encourage broad collaboration across a broad range of fields.

Automakers worldwide are increasingly joining hands to cut costs by building scale and spreading the load of heavy investments in new technologies over large numbers of cars.

The two Japanese automakers already have a technology and manufacturing tie-up.

Mazda licenses gasoline-electric hybrid technology from Toyota and will soon start producing a small sedan based on the Mazda2 for Toyota’s Scion youth brand.