TOKYO — Japanese automaker Toyota Motor will develop fuel cell trucks exclusively for convenience store powerhouse Seven-Eleven Japan, the companies announced Wednesday, aiming to cut carbon emissions by promoting the eco-friendly vehicles.

The hydrogen-powered trucks will ferry goods to Seven-Eleven's stores from its delivery centers. The two companies aim to start jointly testing them in 2019.

Seven-Eleven, a unit of Seven & i Holdings, has about 20,000 convenience stores in Japan, served by some 5,800 delivery trucks. Hybrids and other environmentally friendly vehicles make up about 15% of this fleet, and the company aims to lift that figure to 20% by 2020.