Vehicle Type PCN (Code 52): Weight Limits, Lorry Bans, and the Signs Councils Get Wrong

You can challenge a vehicle type PCN by making representations to the issuing authority within 28 days, and appealing free of charge to an independent adjudicator if it is rejected. The grounds that succeed most often are: the sign did not name your class of vehicle or was not compliant, there was no advance signing so an affected vehicle could not divert, your vehicle was within the permitted class or under the weight limit, the PCN suffix did not match the sign, an access or loading exemption applied, or the camera evidence does not establish the vehicle or its class.

These cameras sit at weight limits on narrow through-routes, environmental restrictions in town centres, and streets closed to general traffic. They catch drivers who are unfamiliar with the area, and drivers of larger vehicles who had nowhere to turn around by the time the restriction appeared. That is exactly where poor signing hides.

The rule, precisely

A prohibition on a type of vehicle is only enforceable if it is signed correctly. The sign must conform to the Traffic Signs Regulations and General Directions 2016, Schedule 3, and it has to identify the class it prohibits. The common ones are Diagram 619 (motor vehicles prohibited), Diagram 619.1 (motor vehicles except solo motorcycles), Diagram 619.2 (solo motorcycles prohibited), and Diagram 622.1A (goods vehicles exceeding the maximum gross weight shown). Each must meet the prescribed size and be positioned so an affected driver can see it and comply.

The letter on your PCN tells you which class the council is relying on. 52g is goods vehicles over the weight indicated. 52m is motor vehicles. 52s is solo motorcycles. 52x is motor vehicles except solo motorcycles. 52v is all vehicles. The class on the notice has to be the class that was actually signed.

The restriction must also be authorised by a Traffic Regulation Order under the Road Traffic Regulation Act 1984, and the physical signs must match that order, including the class prohibited, the hours, and any exemptions.

There is a second requirement that catches councils out on weight and vehicle-type limits. A driver of an affected vehicle has to be told in time to turn off. Proper schemes carry advance warning and alternative-route signs on the approaches, not just a single sign at the point where a lorry can no longer divert. If the first warning you had was at the restriction itself, that is a signing failure, not a driver failure.

Who can fine you

In London, boroughs and Transport for London have enforced these restrictions by camera for years under the London Local Authorities and Transport for London Act 2003. Outside London, councils gained the power from 31 May 2022 under Part 6 of the Traffic Management Act 2004, but only where a Designation Order covers the location. The wider framework, deadlines and appeal routes are in the moving traffic PCN guide.

The grounds that succeed

1. The sign did not name your vehicle, or was not compliant or visible.

The sign has to match the class the council is enforcing. A "no motor vehicles" roundel (Diagram 619) is not a goods-vehicle weight limit (Diagram 622.1A), and the two are not interchangeable. If the sign was the wrong type for the class on your PCN, undersized, obscured, angled away, or missing, the restriction was not properly communicated. Photograph the sign and the approach from a driver’s eye line, early.

2. There was no advance signing, so an affected vehicle could not divert.

Weight and vehicle-type limits need signing on the approach so a driver can take an alternative route before committing. If the only sign was at the entrance to a narrow street with no turning point, a large vehicle was given no realistic chance to comply. This is one of the strongest points on 52g weight-limit cases.

3. Your vehicle is within the permitted class, or under the weight limit.

Diagram 622.1A prohibits goods vehicles over the maximum gross weight shown, which is the plated weight, not the weight of the load on the day. If your vehicle is plated below that figure, or is a class the restriction does not cover, produce the V5C or plating certificate and invite the authority to confirm the exact class it says you breached and how your vehicle falls within it.

4. The PCN suffix does not match the sign.

If the notice says 52m for motor vehicles but the sign was a goods-vehicle weight limit, or the PCN only says "certain types of vehicle" without identifying the class, the contravention has not been made out clearly. Ask the authority to confirm the diagram number of the sign and the precise class prohibited.

5. An exemption applies, or the traffic order does not match the street.

Most goods-vehicle weight limits are environmental and exempt vehicles needing access for loading, unloading, or reaching premises inside the zone. Ask for the Traffic Regulation Order, check the exemptions, and check that the signs on the ground reflect it. A mismatch between the order and the signs is a recognised ground.

6. The evidence does not identify the vehicle or its class.

The camera must be an approved device under the Civil Enforcement of Road Traffic Contraventions (Approved Devices, Charging Guidelines and General Provisions) (England) Regulations 2022 (SI 2022/71). The footage must show your registration and, where the ban depends on class or weight, enough to establish that your vehicle actually falls within the prohibited class. Ask for the full, unedited footage, not just the stills.

What does not work

• “I followed my sat nav.” Sat nav routing is not a defence in itself. But if the restriction was not signed in time for you to divert, that is a signing-compliance ground worth making properly.
• “I only went a short way in and reversed out.” Entering past the sign is the contravention. Argue the sign and the class, not the distance.
• “Other lorries use it all the time.” Other drivers’ conduct has no bearing on your case.
• An apology and an explanation. Case officers cannot cancel a penalty out of sympathy. Give them a legal reason.

Put the authority to proof

A code 52 challenge is a signage and classification case. The representations that succeed pinpoint the element the authority cannot prove, cite the correct diagram and the regulations, and demand the traffic order and full footage that decide it. The closely related restrictions are the no entry PCN and the banned turn PCN, and the underlying signage principles are covered in the defective signs and road markings guide.

The Code 52 Vehicle Type Challenge Letter is built on those grounds, with the vehicle-classification, traffic-order and evidence demands included, for £15.