HGV Weight and Dimension Limits in the UK – Standards for Heavy Goods Vehicles [2026]

The rules on weights and dimensions of Heavy Goods Vehicles (HGV) in the United Kingdom differ from EU regulations in several important respects that can catch carriers accustomed to continental standards by surprise. At the same time, the UK is in some configurations more permissive than the EU — a 44-tonne 6-axle combination is standard practice in the UK, whereas the EU standard is 40 tonnes for a 5-axle outfit. For haulage companies importing and exporting through the United Kingdom, or hiring or purchasing heavy vehicles, a thorough understanding of these rules is absolutely essential: the penalty for overloading can be a £300 fixed penalty notice, and serious violations risk vehicle confiscation and loss of the operator's licence. This article covers the maximum gross vehicle masses for different axle configurations, axle weights, dimensions, special STGO/SPSO permits, and how DVSA carries out HGV weight checks.

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Legal basis and units of measurement

The rules on HGV weights and dimensions in the UK are set out in the Road Vehicles (Construction and Use) Regulations 1986 (as amended) and the Motor Vehicles (Authorisation of Special Types) General Order 2003 (STGO).

A note on units

The UK uses metric tonnes (t) and imperial tons interchangeably. In the context of road traffic law: - 1 tonne (metric) = 1,000 kg - 1 ton (imperial) = 1,016 kg

Technical regulations use metric tonnes. When you see "44 ton" in everyday British usage, it almost always means 44 metric tonnes. The difference is small (16 kg per tonne), but official customs and type-approval documents always quote metric values.

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Maximum gross vehicle mass (GVM) – axle configurations

Rigid vehicles

Number of axles	Maximum gross vehicle mass (GVM)
2-axle	18 tonnes
3-axle	26 tonnes
4-axle	32 tonnes

Articulated combinations (tractor unit + semi-trailer)

Total number of axles	Maximum gross vehicle mass (GVM)
3-axle (2+1)	26 tonnes
4-axle (2+2)	36 tonnes (38t where axle spacing ≥1.3 m)
5-axle (2+3 or 3+2)	40 tonnes
6-axle (3+3)	44 tonnes

Key difference — UK vs EU: In the EU the standard is 40 t for a 5-axle combination. The UK permits 44 tonnes for a 6-axle combination — a significant advantage for hauliers carrying heavy loads, as more freight can be moved in a single trip without splitting the load.

Drawbar combinations (rigid + trailer)

Configuration	Maximum gross vehicle mass
2-axle tractor + 2-axle trailer	36 tonnes
3-axle tractor + 3-axle trailer	44 tonnes

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Axle weights

Exceeding the permitted axle weight is more common than exceeding the GVM — and equally serious in law. UK regulations specify:

Axle type	Maximum load
Single axle	10 tonnes
Tandem axle	18 tonnes (18.5 t where axle spacing ≥1.0 m)
Tridem axle	24 tonnes
Drive axle	11.5 tonnes

Why do axle weights matter so much?

Roads and bridges are designed around axle loads, not the vehicle's total weight. A vehicle within its permitted GVM can still damage the road surface if the load is distributed unevenly across the axles. DVSA checks both GVM and individual axle loads.

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Maximum HGV dimensions

Length

Vehicle type	Maximum length
Rigid vehicle	12 m
Trailer or semi-trailer	12 m (up to 13.6 m for a semi-trailer)
Articulated combination (tractor + semi-trailer)	18.75 m
Drawbar combination	18.75 m
Road train	25.25 m (special types only — EMS)

Width

Vehicle type	Maximum width
Standard HGV	2.55 m
Refrigerated vehicle	2.60 m
Abnormal load	>2.55 m → STGO permit required

Height

The UK does not set a maximum vehicle height in national law. However: - Bridges, tunnels and level crossings carry posted limits (typically 4.2 m or 4.8 m) - The driver is responsible for knowing the route and avoiding structures with insufficient clearance - Many HGV-specific GPS devices (e.g. Garmin dezl, TomTom Trucker) allow route planning with vehicle height taken into account

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Abnormal loads — STGO and SPSO

When a vehicle or load exceeds the standard limits, a special authorisation is required.

STGO (Special Types General Order)

STGO is a regulation that automatically authorises certain classes of abnormal vehicles without the need for an individual permit, provided specific requirements are met. There are three categories:

STGO category	Max. mass	Requirements
Category 1	Up to 50 tonnes	Notification to police and highway authority where mass >44 t
Category 2	50–80 tonnes	Notification mandatory, speed restrictions apply
Category 3	80–150 tonnes	Pilot/escort vehicle required, route pre-approval

SPSO (Special Project Single Trip Order)

For exceptionally heavy or oversized loads (>150 tonnes or dimensions exceeding STGO). Requires an individual authorisation from the Department for Transport (DfT) or the relevant highway authority.

Notifying police and highway authorities

For Category 2 and 3 movements the following notifications are required: - Network Rail if the route crosses any railway lines - National Highways (motorways) or the relevant local highway authority - At least 5 working days before the planned date of movement

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DVSA weight checks — how do they work?

DVSA carries out HGV weight checks in several ways:

Weigh-in-Motion (WIM)

Inductive loops or piezoelectric sensors embedded in the road surface. A vehicle passing over them is weighed without being stopped. If the WIM reading indicates a potential breach, the vehicle may be directed to a static check.

Static roadside weighing

DVSA officers use portable axle weighpads or direct vehicles to a fixed weighbridge. They check: - GVM (gross vehicle mass) - Individual axle loads - Vehicle documents (operator licence, tachograph records)

DVSA mobile enforcement units

DVSA runs patrols on the road network with mobile weighing equipment. Vehicles are stopped and weighed on the spot — no fixed enforcement site is needed.

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Penalties for overloading and exceeding dimensions

Fixed Penalty Notices

Offence	Penalty
GVM exceeded by <5%	£100 fixed penalty
GVM exceeded by 5–10%	£200 fixed penalty
GVM exceeded by >10%	£300 fixed penalty + possible prosecution
Axle weight exceeded	£100–£300 fixed penalty
STGO authorisation missing	£300 + prosecution

Prosecution

In serious cases the matter proceeds to court. Possible consequences: - Fine of up to £5,000 for the driver - Fine for the operator (unlimited) - Penalty points on the driving licence - Vehicle Immobilisation — the vehicle is immobilised until the load is redistributed

Seizure

In cases of very serious breaches, or where immediate correction is not possible, DVSA may seize the vehicle. The costs of storage and release are borne by the operator.

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UK vs EU — comparison of key limits

Parameter	UK	EU (Directive 96/53/EC)
Max. GVM (standard)	44 t (6-axle)	40 t (5-axle)
Max. combination length	18.75 m	18.75 m
Max. width	2.55 m	2.55 m
Single axle	10 t	10 t
Drive axle	11.5 t	11.5 t
Tandem axle	18 t	18 t
Tridem axle	24 t	24 t
Max. height	No national limit	4 m (informal)

Practical implication: A haulier operating a 44-tonne 6-axle outfit in the UK must reduce the load to 40 tonnes when entering EU member states (or reconfigure the combination). This is worth bearing in mind when planning routes and loads for export customers.

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Special applications — construction and agricultural vehicles

Construction vehicles (Construction & Use)

Mobile cranes, concrete mixers, concrete pumps and other construction vehicles may be covered by special C&U provisions: - Mobile crane carriers: up to 44 t and beyond, subject to STGO conditions - Concrete mixers: standard GVM limits + exemption from tachograph requirement within a 50 km radius

Agricultural tractors

Agricultural tractors and farm machinery have their own separate rules: - Maximum speed: 25 mph (40 km/h) on public roads - Weight: up to 18 t per axle and up to 24 t for a two-axle tractor with trailer - No operator's licence required