The US is investing $80 million (£54.4m) to improve the efficiency of trucks.
The money from the Department of Energy (DoE) will fund the research, development and demonstration of technologies which aim to improve heavy-truck freight efficiency by more than 100%.
The projects will use a variety of truck and trailer technology approaches such as engine efficiency, drivetrain efficiency, tire rolling resistance and vehicle weight.
The DoE has also announced more than $12 million (£8.16m) for three projects that will focus on the research, development and demonstration of plug-in electric powertrain technologies for medium and heavy-duty vehicles.
Reuben Sarkar, Deputy Assistant Secretary for Transportation said: “Improving the efficiency of commercial trucks is critical to reducing our petroleum consumption, strengthening our clean energy economy and further reducing our contributions to climate change. This new funding will not only accelerate innovation but also foster rapid market adoption of new energy efficient vehicle technologies.”