Photo Credit: Department of Transportation
At first glance, platooning doesn’t look like much – just a few tractor-trailers driving down the highway a bit closer together than we’re used to. But, what is actually happening is much more complex and presents the opportunity for significant safety, energy efficiency, and cost benefits. Early studies have shown that 65% of current long-haul truck miles could potentially be platooned, reducing total truck fuel consumption by 4%.
What is Platooning?
So, what is truck platooning? Platooning involves the use of vehicle-to-vehicle communications and sensors, such as cameras and radar, to virtually connect two or more trucks together in a convoy. The virtual link enables all of the vehicles in the platoon to communicate with each other, allowing them to automatically accelerate together, brake together, and enables them to follow each other at a closer distance than is typically possible with unlinked trucks.
The technology detects and reacts to stopped or slow vehicles ahead of the platoon and adjusts as needed when a vehicle cuts in between the trucks in the platoon. With current platooning technology, each truck in the platoon has a human driver responsible for steering and taking over the speed and braking as needed. The driver of the first truck leads the platoon and navigates the route. As the technology improves, there may only be the need for a lead driver, or no human drivers at all.
Why do it?
Truck platooning could provide many benefits. When implemented, platooning can improve safety, increase energy efficiency, and reduce costs.
Truck platooning technology includes automatic braking. The automatic brakes are able to react much faster than a human, improving safety and reducing the likelihood of collisions. Truck platoons also take up less space on the road, and experience fewer short or sudden acceleration and braking events, than unlinked trucks. The trucks travelling closer together at smoother speeds improves traffic flow and boosts the efficiency of delivering goods.
Platooning is also a cost saver. With the trucks driving close together at a constant speed, the lead vehicle cuts through the air and reduces the amount of air hitting the front of, and flowing between, the following vehicles. This is similar to when race cars or cyclists draft off one another in a race. The reduced aerodynamic drag on all of the vehicles in the platoon means that the trucks use less fuel, which reduces operating costs.
The U.S. Army is interested in platooning technologies for the potential to reduce the number of lives at risk in combat areas. Using platooning technologies in military applications could minimize the number of soldiers needed to man convoy vehicles, resulting in a reduced number of soldiers at risk of encountering roadside bombs.
The Department of Energy’s Vehicle Technologies Office’s (VTO) Energy Efficient Mobility Systems (EEMS) Program coordinates with the U.S Army and the Department of Transportation (DOT) in this shared space to accelerate research and development. DOT’s mission is to serve the United States by ensuring a fast, safe, efficient, accessible and convenient transportation system. DOT sees platooning as one way to improve the safety of trucking through collision avoidance features. VTO is interested in the potential to improve energy efficiency and cut costs for businesses and consumers through this technology.
VTO’s EEMS Program is investigating the potential impact platooning technology could have on energy use in our transportation system. Recent EEMS research done by the National Renewable Energy Laboratory used telematics, or on-board data logging, to estimate the amount of platoonable miles travelled by trucks and found 65% of the miles could be platooned, resulting in a 4% reduction in total truck fuel consumption. Another recent VTO funded study assessed the energy impact of adaptive cruise control and showed that the middle truck in a platoon saves the most at shorter gaps, while the trailing truck saves the most at longer gaps.