Speed Limiter Exemptions: Which Vehicles Are Exempt in the UK?

While speed limiters are a legal requirement for most heavy goods vehicles and passenger-carrying vehicles in the UK, there are specific exemptions written into the legislation. Understanding which vehicles are exempt — and which are not — prevents compliance errors that could result in DVSA enforcement action.

This article provides a complete list of speed limiter exemptions under UK law, with practical guidance for fleet operators.

The General Rule

The starting point is that all goods vehicles with a maximum gross vehicle weight (GVW) exceeding 3.5 tonnes and all motor vehicles adapted to carry more than 8 passengers must be fitted with a speed limiter. The set speed is 90 km/h (56mph) for goods vehicles and 100 km/h (62mph) for passenger vehicles.

Exemptions are the exception, not the rule. Most commercial vehicles on UK roads require a speed limiter. The exemptions listed below are narrowly defined.

Exempt Vehicle Categories

1. Emergency Service Vehicles

Vehicles used by the emergency services are exempt from speed limiter requirements when used for emergency service purposes. This includes fire engines and fire service vehicles, ambulances and emergency medical vehicles, and police vehicles.

The exemption applies to the vehicle, not the service. A fire brigade’s administrative van does not qualify for the exemption. The exemption covers vehicles that may need to exceed normal speed limits when responding to emergencies — the rationale being that a speed limiter could prevent the vehicle from reaching an incident in time.

Note that some emergency services voluntarily fit speed limiters to non-emergency response vehicles within their fleets (pool cars, transport vehicles, stores vehicles). This is a fleet management decision rather than a regulatory requirement.

2. Military Vehicles

Vehicles belonging to the armed forces are exempt from speed limiter requirements. This covers vehicles owned or operated by the Ministry of Defence, including the British Army, Royal Navy, and Royal Air Force.

The exemption applies to military-owned vehicles used for military purposes. Civilian-owned vehicles under contract to the MoD do not automatically qualify — they must comply with normal speed limiter requirements unless specifically exempted under the terms of their contract.

3. Vehicles That Cannot Exceed the Speed Limit by Design

Vehicles that are incapable of exceeding the relevant speed limit (90 km/h for goods vehicles, 100 km/h for passenger vehicles) by design do not require a speed limiter to be fitted. The logic is straightforward: there is no need for a device to prevent the vehicle exceeding a speed it cannot physically reach.

This exemption is relevant for certain specialist vehicles with very low power-to-weight ratios, such as heavily laden special types (heavy haulage vehicles operating under STGO orders), some agricultural vehicles when used on public roads, and certain slow-moving specialist vehicles (road sweepers, refuse collection vehicles).

However, operators should be careful about claiming this exemption. If the vehicle is physically capable of exceeding the speed limit — even on a downhill gradient — the exemption does not apply. DVSA takes a practical view: if the vehicle could exceed the limit under any realistic operating condition, a speed limiter is required.

4. Vehicles Used Only for Public Order or Civil Defence

Vehicles used exclusively for maintaining public order (riot vehicles, for example) or for civil defence purposes may be exempt. This is a narrow exemption that applies to very few vehicles in practice.

5. Vehicles Undergoing Road Testing

Vehicles undergoing road testing by manufacturers or approved testing organisations are exempt during the period of testing. This allows vehicle manufacturers and engineering companies to test vehicles at speeds above the normal speed limiter threshold for development and certification purposes.

This exemption does not cover normal commercial operation. A vehicle that has been tested is not exempt from speed limiter requirements when it enters regular service.

6. Historic Vehicles

There is no blanket exemption for historic vehicles based on age alone. However, vehicles that were manufactured before speed limiter requirements came into force (1988 for new goods vehicles, 1992 for in-service goods vehicles) and have not been substantially modified may qualify for an exemption in certain circumstances. The key question is whether the vehicle was subject to speed limiter requirements at the time of its manufacture or first registration.

In practice, very few historic commercial vehicles are still in regular commercial service. Those that are — typically at heritage events or for specialist transport — should seek specific guidance from DVSA.

Common Misconceptions

”My vehicle does short journeys, so it’s exempt”

There is no mileage-based or journey-length exemption. A goods vehicle over 3.5 tonnes requires a speed limiter regardless of whether it covers 100 miles per day or 10 miles per day.

”My vehicle only operates on private land, so it’s exempt”

If the vehicle ever travels on public roads — even briefly, between sites or for fuelling — it requires a speed limiter. The exemption only applies if the vehicle never uses public roads. Agricultural vehicles that operate exclusively on farm land and are transported between locations on a trailer would qualify, but this is unusual for vehicles over 3.5 tonnes.

”Vans under 3.5 tonnes are exempt”

This is not an exemption — vans under 3.5 tonnes were never subject to the speed limiter requirement in the first place. The regulation applies to goods vehicles exceeding 3.5 tonnes GVW. Vehicles below this threshold are outside the scope of the regulation.

”I have a speed limiter in the ECU, so I don’t need a separate device”

Some vehicle manufacturers build speed limiting functionality into the engine management system. Whether this satisfies the regulatory requirement depends on whether the built-in system is EU/ECE R89 type-approved, properly sealed and tamper-evident, and documented with a speed limiter plate.

Many factory-fitted speed limiting systems do not meet all of these requirements. Check with the vehicle manufacturer and, if in doubt, fit an approved aftermarket speed limiter.

If You Are Unsure

If you are not certain whether your vehicles require speed limiters, the safe approach is to have them fitted. The cost of fitting an AutoKontrol speed limiter is modest compared to the consequences of non-compliance — DVSA prohibition notices, fines, and potential operator licence action.

Contact AutoKontrol for advice on your specific vehicles and circumstances. We can confirm whether your vehicles require speed limiters and, if so, provide a quotation for supply and installation.