Freight Transport by Road Energy Efficiency

Why Energy Efficiency Matters in Road Freight

Energy efficiency in road freight is the ratio of useful transport work (tonkilometres) to the amount of fuel or electricity consumed. Higher efficiency means fewer liters of diesel or fewer kilowatthours of electricity are needed for each tonnekilometre moved. The benefits are threefold:

1. Cost reduction: Fuel is the single biggest operating expense for transport companies. A 10% improvement in efficiency can cut annual fuel costs by tens of millions of dollars for large fleets.
2. Environmental impact: Less fuel burned reduces carbon dioxide (CO), nitrogen oxides (NO) and particulate matter (PM) emissions, helping to meet climate targets and improve air quality.
3. Energy security: Efficient use of existing energy resources lessens reliance on imported oil and eases pressure on national energy grids.

Key Factors Influencing Energy Efficiency

Several variables determine how much energy a truck uses per kilometre. They can be grouped into vehiclerelated, operational, and external factors.

VehicleRelated Factors

• Engine technology: Modern diesel engines with commonrail injection, turbocharging and exhaust aftertreatment are up to 15% more efficient than older models.
• Powertrain type: Hybrid electric trucks capture braking energy, while full electric vehicles (EVs) eliminate tailpipe emissions altogether, though their efficiency depends on the electricity mix.
• Aerodynamics: Streamlined cab designs, side skirts, and tail fairings can reduce drag by up to 10%, saving fuel especially at highway speeds.
• Weight and rolling resistance: Lighter chassis materials (highstrength steel, aluminium, composites) and lowrollingresistance tyres lower the energy required to move the vehicle.

Operational Factors

• Load factor: Transporting a vehicle close to its maximum payload improves energy per tonnekilometre. Empty or lightlyloaded trips are the least efficient.
• Speed management: Fuel consumption rises exponentially above 80km/h. Speed limit compliance and intelligent speed assistance can cut fuel use by 510% on long hauls.
• Route optimisation: Selecting the shortest distance while avoiding congested streets reduces idle time and unnecessary mileage.
• Driving style: Ecodriving techniquessmooth acceleration, early gear shifts, and anticipatory brakingcan improve efficiency by up to 15%.

External Factors

• Road infrastructure: Wellmaintained surfaces lower rolling resistance. Intelligent transport systems (ITS) that provide realtime traffic data help drivers avoid stopandgo conditions.
• Topography and climate: Hilly terrain, strong headwinds, and extreme temperatures increase fuel consumption. Seasonal planning can mitigate some of these effects.
• Regulatory environment: Emission standards, fuel taxes, and incentives for lowcarbon vehicles shape fleet composition and operating practices.

Technological Innovations Driving Efficiency

Innovation in both hardware and software is reshaping the energy profile of road freight.

Alternative Fuels

Biodiesel, renewable natural gas (RNG), and hydrogenbased fuels provide lower carbon intensity than conventional diesel. When blended appropriately, they can be used in existing engines with minimal modifications, allowing a gradual transition towards decarbonisation.

Electrification

Battery electric trucks (BETs) are entering the market for regional distribution (up to 300km per charge). Their welltowheel efficiency often exceeds 70% compared with 3035% for diesel, especially when the electricity comes from renewable sources. Rapidcharging stations and opportunitycharging (e.g., at loading docks) are key to expanding their range.

Connected & Autonomous Systems

Vehicletoinfrastructure (V2I) communication enables dynamic speed advisories and platooningcoordinated travel of multiple trucks at reduced intervehicle gaps. Platooning can cut aerodynamic drag for trailing vehicles, delivering fuel savings of 510% over long distances.

DataDriven Optimisation

Telematics platforms collect data on speed, fuel consumption, route deviation and driver behaviour. Machinelearning algorithms analyse this data to provide actionable recommendations, such as optimal departure times, recommended cruise speeds, and maintenance alerts.

Policy Measures Supporting Higher Efficiency

Governments can accelerate the shift to more efficient freight transport through a blend of regulations, incentives, and infrastructure investments.

• Fuelefficiency standards: Mandatory CO targets for new trucks push manufacturers toward lighter designs and better aerodynamics.
• Tax incentives: Reduced registration fees, lower road taxes, or fuel tax credits for lowemission vehicles encourage fleet renewal.
• Infrastructure funding: Investment in dedicated electriccharging corridors, highcapacity loading bays, and smart traffic management systems reduces operational barriers.
• Freight consolidation hubs: Centralised loading points enable better load factor utilisation, decreasing the number of empty runs.
• Information campaigns: Publicsector programmes that promote ecodriving and provide training for professional drivers improve average driving behaviour.

BestPractice Case Studies

Realworld examples illustrate how the combination of technology and management can achieve substantial gains.

NorthWest European Logistics Cluster

A consortium of 12 shippers and carriers introduced a shared digital platform that consolidated demand, optimised routes, and coordinated loading. Over three years, the cluster reduced emptytruck mileage by 22% and saved roughly 15million litres of diesel, equating to a CO reduction of 40000tonnes.

Electric Delivery Fleet in Scandinavia

A major retailer deployed 200 batteryelectric vans for lastmile deliveries in urban areas. By partnering with a utility to install fastcharging stations at depots, the fleet achieved a 78% reduction in pervehicle fuel consumption and eliminated tailpipe emissions within city limits.

Platooning Pilot on a Major Highway

A freight company tested a 12truck platoon on a 500kilometre stretch of highway. The trailing trucks experienced a 7% fuel saving, while the lead vehicle saw a modest 2% increase in efficiency due to smoother speed control. The pilot demonstrated that even partial adoption of platooning can produce measurable benefits.

Future Outlook

Continued progress in energy efficiency will be driven by the convergence of stricter emissions legislation, falling costs of batteries, and increasing digitalisation of logistics. By 2035, most new heavyduty trucks sold in the EU are expected to be either lowemission diesel or electric, with a sizeable share of longhaul traffic operating under autonomous or semiautonomous control. The cumulative effect of these changes should lower the average energy consumption of road freight by at least 30% relative to 2020 levels.

Key Takeaways

• Vehicle design (engine, aerodynamics, weight) and operating practices (load factor, speed, route) together dictate energy efficiency.
• Electrification and alternative fuels offer the greatest potential for reducing carbon intensity, especially when paired with renewable electricity.
• Connected technologies, such as telematics and platooning, provide immediate efficiency gains without large capital outlays.
• Policy instrumentsstandards, incentives, and infrastructure supportare essential to overcome market barriers.
• Successful case studies show that collaboration across the supply chain amplifies individual efficiency measures.

Improving the energy efficiency of freight transport by road is not a singlesolution challenge. It requires coordinated action across manufacturers, operators, regulators, and technology providers. As the sector moves toward increasingly stringent climate goals, the solutions outlined above will become integral parts of everyday logistics, delivering both economic and environmental dividends.