Volvo Trucks has unveiled a new generation of its I-Roll technology that adds an engine stop/start function – a world first for heavy-duty trucks. The system is designed to further reduce fuel consumption and CO₂ emissions by automatically shutting down the engine when it’s not needed.
The innovation builds on Volvo’s existing I-See and I-Roll systems, using real-time road and topography data to identify when the truck is about to enter a downhill stretch. When conditions allow, the engine switches off temporarily, consuming no fuel and producing no tailpipe emissions.
Jan Hjelmgren, Head of Product Management at Volvo Trucks, said:
“Our engineers have done it again – innovating a new engine technology that contributes to making transport by truck more fuel-efficient. As part of our decarbonisation strategy, we will continue to innovate to make our combustion engines even better and to reduce our impact on the environment.”
The new feature activates at speeds above 60 km/h, and depending on road conditions and temperature, can reduce fuel consumption and CO₂ emissions by up to one per cent. While the figure may sound small, Volvo notes that when added to gains already achieved through aerodynamic and drivetrain improvements, the cumulative impact on fleet efficiency is significant — especially for long-haul operations.
A step beyond I-Roll and I-See
Volvo’s latest stop/start feature reflects years of incremental progress in predictive cruise control and coasting technologies. The I-See system maps routes and optimises gear selection based on elevation and road curvature, while I-Roll disengages the driveline to allow controlled coasting when torque isn’t required.
By integrating an engine stop/start function into this system, Volvo takes another step toward reducing emissions from conventional powertrains without compromising drivability.
The company’s recent 2025 Green Truck Award win with the Volvo FH Aero demonstrates the effectiveness of this combined approach. The Aero cab, introduced in 2024 and refined further this year, has already delivered measurable fuel savings through improved aerodynamics.
Available from November 2025
The stop/start functionality will be available on Volvo FH and FH Aero models equipped with the 13-litre diesel engine. Customer orders open in November 2025.
For fleet operators, the technology promises lower fuel bills, reduced emissions, and better alignment with sustainability goals — outcomes that also align with regulatory and industry expectations in Australia under the Heavy Vehicle National Law (HVNL).
The National Heavy Vehicle Regulator (NHVR) continues to encourage innovation that supports safety, efficiency, and environmental performance across Australia’s heavy vehicle fleet. With over one million registered heavy vehicles nationwide, even small percentage improvements in fuel efficiency can translate into substantial national CO₂ reductions.
Decarbonisation through multiple pathways
Volvo Trucks’ broader decarbonisation strategy includes multiple fuel and powertrain options — from renewable diesel and biogas to battery-electric and fuel-cell electric models. The company’s message is clear: while electric vehicles are the long-term solution, cleaner combustion engines remain an essential part of the transition.
As fleets continue to balance operational needs with sustainability targets, innovations like I-Roll with stop/start show that there is still efficiency to be gained from internal combustion — one slope at a time.
