TL;DR

  • 3PL sustainability means cutting the emissions and waste from the transport and warehousing a 3PL runs for its clients.
  • Transport is the UK’s highest-emitting sector, and every empty or part-empty truck burns fuel without moving goods.
  • Load consolidation, planned backhauls and dynamic route optimisation all cut the distance trucks run empty.
  • Clients want emissions data reported in line with recognised methods such as the GLEC Framework.
  • Fewer empty miles also lower the cost per delivery.

Almost a third of the distance driven by GB-registered lorries in 2025 carried nothing. Those HGVs ran 5,897 million kilometres empty, which the Department for Transport puts at 31% of all HGV kilometres.

The share barely moved from 30% in 2024. For a 3PL, each of those kilometres is fuel, driver time and carbon that no client pays for.

Clients are asking about it too. Many now request emissions data in tenders and want proof of progress at renewal. That has turned 3PL sustainability into an operations question as much as a reporting one.

What Is 3PL Sustainability?

3PL sustainability is the work a third-party logistics provider does to cut the environmental impact of the services it runs for clients. It covers fuel and emissions from transport, energy used in warehouses, and the packaging and waste that pass through its sites.

Two other sides sit alongside the environmental one. The social side covers driver hours, road safety and air quality around depots, while the economic side asks whether each change holds up on cost.

This guide focuses on transport, the part of the footprint a 3PL’s planning changes most directly.

That planning sits at the heart of wider 3PL management, so the same data can track cost and carbon.

Why 3PL Sustainability Matters for UK Logistics Providers

Pressure on UK logistics providers now comes from clients, public buyers, city rules and running costs.

Domestic transport produced 30% of UK domestic greenhouse gas emissions in 2024, the highest share of any sector. Road vehicles made up 90% of that transport total.

Shippers that report their own footprint need figures from the 3PLs that move their goods, so emissions questions now turn up in tenders.

Public buyers have put it in writing. Under PPN 006, central government buyers can ask bidders on contracts above £5 million a year for a Carbon Reduction Plan and a net zero 2050 commitment. Requirements vary, so check each tender.

City rules add another push. England has seven charging clean air zones, in Bath, Birmingham, Bradford, Bristol, Portsmouth, Sheffield and Tyneside. All seven charge HGVs below Euro VI, and every zone except Portsmouth also charges older vans.

The commercial case is simple. An empty return leg still pays for fuel, tyres and driver hours, yet earns nothing.

Much of the planning behind empty-mile savings now runs on software, as our piece on AI for sustainable logistics explains.

Where 3PL Emissions Come From

Most 3PL emissions fall into five areas. The first three happen on the road, from linehaul trunking to the final drop.

  • Trunking and linehaul between sites: Heavy trucks move freight between hubs, depots and client sites.
  • Last mile and multi-drop runs: Vans and rigids make many short stops in towns and cities.
  • Empty and part-loaded running: Trucks that return empty or leave half full still burn fuel and wear tyres while moving little freight.
  • Warehouse energy use: Lighting, heating, cooling, chargers and handling kit all draw power.
  • Packaging and returns: Packing materials add waste, and every return creates extra trips and handling.

UK data shows why both road segments matter. In 2024, HGVs produced 18.4 million tonnes of CO2e and light vans 18.6 million tonnes, each 17% of domestic transport emissions.

Empty running cuts across both, and a 3PL can reduce it without buying a new vehicle.

How 3PLs Can Reduce Empty Miles

Empty running is a planning problem before it is a vehicle problem. The six steps below tackle it.

Consolidate Loads Across Clients

A 3PL carries freight for many clients at once. Two half-full trailers heading to the same region can often become one full trailer.

Start with lanes where several clients ship to the same area on the same days. Agree delivery windows that let freight wait a few hours for a partner load. Then compare fill before and after.

Plan Backhauls and Return Loads

A truck that drops in Leeds and drives home empty to Daventry has done half a job. A backhaul gives that return leg a paying load.

Look first at supplier collections near the drop point and at other clients on the reverse lane. Freight exchanges and partner hauliers can fill the remaining gaps.

Plan the backhaul with the outbound run, because a return load found at 4pm usually comes too late.

Use Dynamic Route Optimisation

This approach re-plans routes as conditions change, using live data on traffic, cancellations, new orders and vehicle capacity. A static plan built the night before cannot react when a 9am collection drops out.

When one job falls away during the day, the planner can slot a nearby pickup into a truck that would otherwise run a back light. Our guide to dynamic route planning explains the method further.

Balance Own Fleet and Subcontracted Hauliers

Most 3PLs mix their own trucks with subcontracted hauliers, and the mix shapes empty running.

Own-fleet trucks have to come home, so they suit lanes where you can build a return load. Subcontractors suit one-way lanes, because a haulier based near the drop point can often find its own return work.

Review the split each quarter, since a lane that runs empty every week may be cheaper and cleaner on a partner’s truck.

Match the Vehicle to the Load

A 44-tonne artic carrying six pallets is a poor use of fuel when a smaller rigid could do the job. Match vehicle size to the measured cube and weight of each load.

Pallet counts alone can mislead, because stacking rules and axle limits often decide what fits. Good vehicle load planning checks those limits before booking.

Cut Failed Deliveries and Repeat Trips

Every failed delivery means a second trip to the same address. That trip adds distance, fuel and driver time with no extra revenue.

Common causes include wrong addresses, missed time windows and customers who are out. Fix address data before dispatch, send accurate ETAs, and offer safe-place or locker options.

The cost of failed deliveries goes well beyond fuel, so these fixes help the margin as well as the footprint.

Other Ways 3PLs Reduce Emissions

Empty miles are only one part of the footprint. These five steps cover most of the rest.

  • Electric and alternative-fuel vehicles. Battery-electric vans can suit urban multi-drop routes with predictable daily distances. HGVs face fixed dates. Sales of new non-zero-emission HGVs of 26 tonnes and under end from 2035, and all new HGVs must be zero emission from 2040.
  • Warehouse energy. LED lighting, rooftop solar and efficient handling equipment all cut the power a site draws.
  • Right-sized and reusable packaging. Boxes that fit the product reduce void fill and let more orders fit on each pallet. Reusable totes suit closed loops between known sites.
  • Greener returns handling. Consolidate returns at local hubs and collect them on planned rounds. Our article on sustainable returns covers more ideas.
  • Shared networks with other carriers. Sharing capacity on thin lanes fills trucks that neither firm could fill alone.

How to Measure and Report 3PL Emissions

Clients will only trust your progress if they can check the method behind it.

ISO 14083, published in March 2023, is the international standard for quantifying and reporting greenhouse gas emissions from transport chains.

The UK edition, BS EN ISO 14083, covers all transport modes and includes emissions from transport hubs where freight moves between legs. It deals with calculating emissions only, so carbon offsetting sits outside its scope.

The GLEC Framework, from Smart Freight Centre, is the primary industry guideline for putting ISO 14083 into practice. Shippers, carriers and logistics service providers can all use it, across every mode and logistics site.

GLEC lets companies add up results leg by leg. That suits a 3PL, because one shipment may pass through trunking, a cross-dock and a subcontracted last-mile run.

Clients want shipment-level data they can roll into their own reports, usually fuel or energy used, distance, weight, vehicle type and whether each leg ran empty.

Capture that data as the work happens, because rebuilding it at year-end is slow. Your own reporting duties depend on your size and contracts, so confirm them with an adviser.

Key Sustainability Metrics for 3PLs

Track these core metrics, broken down by lane, client and vehicle type.

Metric What it shows How to calculate Note
Empty running % Share of distance driven with no load Empty km ÷ total km × 100 GB HGV average was 31% in 2025 (DfT)
Load fill How full each vehicle is when it leaves Load carried ÷ vehicle capacity, by weight, pallets or cube Averages hide weak lanes
CO2e per tonne-km Emissions for each tonne moved one kilometre Total CO2e ÷ tonne-km Suits trunking and pallet freight
CO2e per parcel Emissions for each delivered item Total CO2e for a round ÷ parcels delivered Suits last-mile and parcel networks
Miles per drop Distance driven for each completed stop Route miles ÷ successful drops Falls as route density rises
First-attempt delivery rate Share of deliveries completed on the first try First-time successes ÷ attempted deliveries × 100 Each failure adds a repeat trip

First-attempt rate is where carbon and service meet. Our guide to first-attempt delivery covers ways to lift it.

Common Challenges in 3PL Sustainability

Four obstacles tend to slow progress.

  • Upfront cost of new vehicles and equipment. Electric trucks, chargers and site upgrades need capital before they save anything. Adoption is still early, with about 1,000 of the UK’s 520,000 licensed HGVs zero emission at the end of 2025.
  • Gaps in subcontractor and carrier data. Subcontracted legs often sit outside a 3PL’s own telematics. Without partner fuel or distance data, reports fall back on default values.
  • Client service promises that limit consolidation. Tight delivery windows and dedicated-vehicle contracts make loads hard to combine. Raise the trade-off at contract review, using fill and cost data.
  • Skills and change management. Planners used to building routes by hand may distrust new tools. Start with one depot, share the before-and-after numbers, and let the results make the case.

How Shipsy Helps 3PLs Cut Empty Miles

Shipsy gives 3PLs the planning tools behind several steps in this guide.

For trunking, Shipsy’s middle mile hub operations software uses AI to consolidate shipments and plan vehicle loading and hub-to-hub routes. The aim is to maximise truck fill and minimise empty running. It also tracks linehaul trips in real time with predictive ETAs.

For local and multi-drop work, Shipsy’s route optimisation and planning tool sequences multi-stop routes against more than 100 configurable constraints. Routes adjust in real time as traffic, cancellations and new orders change the day. A control tower scores every vehicle and route on distance, time and cost.

For subcontracted work, Shipsy’s multi-carrier management module scores each shipment against cost, capacity and service history. It then allocates the carrier within the rules you set by region, service type or cost threshold.

Conclusion

Empty running is the clearest gap in UK road freight, with 31% of HGV kilometres run empty in 2025. Closing it takes better load building, planned backhauls, live re-routing and the right mix of own and partner trucks.

Start with the metrics. Measure empty running, load fill and CO2e per tonne-km by lane, then fix the worst lanes first. Report the gains with a recognised method so clients can check them.

A 3PL sustainability plan built this way cuts cost and carbon together. To see how it works on your network, book a demo with Shipsy.