Do cameras have to be yellow? Is “10% plus 2” really law? Motoring lawyer Jeremy Sirrell separates UK speeding law from motoring folklore and explains the mistakes that could cost drivers their licences
Do speed cameras have to be yellow? Is the famous “10% plus 2 mph” allowance actually written into law? Can you briefly exceed the limit while overtaking, or argue that a 20 mph restriction is absurd for the road? Speeding law inspires more folklore than almost any other part of motoring. Unfortunately, repeating something confidently in a pub, owners’ club or WhatsApp group does not turn it into a defence.
To separate the rules from the rumours, I spoke to Jeremy Sirrell, Director, COLP and MLRO at Palmers Solicitors. Jeremy began his career advising magistrates, joined the Crown Prosecution Service as a Crown Prosecutor and later moved into private practice. Around half of his current work concerns road traffic law, with the remainder focused on serious criminal cases.
That gives him a useful view from several sides of the courtroom. It also helps that his move into private practice was partly inspired by noticing that defence solicitors appeared to have the best cars in the court car park. Finally, a career decision based on proper research.
Why are more drivers receiving speeding tickets?
Jeremy’s short answer is the proliferation of automated enforcement.
A police officer who stops a driver can assess the circumstances. Depending on the facts, the officer may issue a ticket, report the driver or send them away with a warning. A camera records an alleged offence and feeds it into an administrative process without that roadside conversation.
This does not make cameras inherently unfair, although it does make enforcement feel less human. Drivers can be detected at quiet times and on apparently empty roads just as readily as during busy periods.
The practical lesson is simple: the posted limit applies regardless of how clear the road appears. Government road-safety guidance describes the speed limit as the absolute maximum, while also reminding drivers that conditions may require a speed below that limit.
The biggest mistake after receiving a speeding notice
Ignoring the paperwork is the most damaging common response.
A request for driver information is commonly made under Section 172 of the Road Traffic Act 1988. Failing to provide the required information can become a separate offence carrying six penalty points. That can be considerably worse than the likely outcome of the original allegation.
The Highway Code’s penalties table lists failure to identify the driver as carrying six points and a fine of up to £1,000. By comparison, the standard minimum speeding penalty is £100 and three points, although the outcome depends on the alleged speed and circumstances.
Deal with every notice promptly, keep copies and record when and how your response was sent. If anything is unclear, obtain legal advice early. The kitchen drawer is not a recognised branch of the justice system.
Do speed cameras legally have to be yellow?
Yellow cameras are widely treated as a legal requirement, but colour alone is not a reliable route out of an allegation.
Government guidance and strategic-road policy have promoted visible yellow camera housings. In 2015, the government announced that working cameras on England’s strategic road network would be made yellow, and guidance has addressed yellow treatment for fixed housings.
That does not mean a driver may exceed the limit when a camera is grey, obscured or difficult to spot. The enforceable obligation is to comply with the speed limit. Average-speed and variable-limit systems can also look very different from the familiar roadside camera box.
Is “10% plus 2 mph” actually law?
No statutory entitlement allows a driver to exceed the limit by ten per cent plus two miles per hour.
Enforcement bodies may apply operational thresholds or tolerances, and equipment accuracy must be taken into account. Those practices can vary and policies can change. They should never be treated as an additional personal speed allowance.
If the sign says 30 mph, the legal limit is 30 mph. A driver who plans around a rumoured threshold is effectively gambling their licence on an enforcement policy they do not control.
The issue becomes particularly acute in a 20 mph limit. A tiny numerical difference can be enough to move a vehicle from legal speed to an alleged offence, making constant awareness essential.
Can hard acceleration trigger a speed camera?
A conventional speed camera is interested in measured speed rather than how enthusiastically the vehicle reached it. Accelerating briskly while remaining within the limit should not, by itself, produce a speeding offence.
Driving behaviour can still attract police attention. Aggressive acceleration in a crowded urban area, near pedestrians or among emerging traffic could potentially raise questions about careless or inconsiderate driving, even if the vehicle remains below the posted speed.
For enthusiastic drivers, legal does not always mean sensible. Context matters.
Does overtaking provide a defence to speeding?
Completing an overtake does not create a general exemption from the speed limit.
A roadside officer may take the complete circumstances into account. An automated camera simply records the measured speed. Arguing that additional speed made the manoeuvre shorter is unlikely to make the allegation disappear. If an overtake requires breaking the limit, that is a strong clue that the manoeuvre should be reconsidered.
A genuine emergency or immediate danger can raise different legal arguments. Jeremy explains that circumstances may sometimes support a “special reasons” submission, potentially affecting endorsement or punishment.
Can a speeding ticket be challenged successfully?
Yes, although successful challenges depend on evidence rather than a secret technicality.
Evidence from a following police vehicle may sometimes be examined and tested. Camera or laser evidence can also be investigated, but modern approved equipment is designed to be accurate and technical challenges are rarely straightforward.
Equipment errors can occur. In December 2025, the Department for Transport confirmed an anomaly involving the interaction between some variable speed cameras and signs on parts of England’s strategic road network. National Highways identified approximately 2,650 erroneous camera activations since 2021 from more than six million activations on affected roads. People identified as affected were to be contacted, reimbursed and have points removed where relevant.
What if you genuinely do not know who was driving?
Section 172 requires the recipient of a notice to provide information about the driver. Occasionally, two people may have shared a long journey and genuinely be unable to remember who was driving at the precise time and location.
The correct response is not silence. Provide all the information available, explain the circumstances honestly and retain copies. Relevant material might include journey records, receipts, location history, photographs, messages or the details of every possible driver.
Courts will consider whether reasonable diligence was exercised. A company operating shared vehicles is particularly vulnerable if it has no adequate system for recording who used each vehicle.
Claiming uncertainty is not a clever workaround. The credibility of the explanation and the steps taken to identify the driver will matter.
Can incorrect paperwork make the case collapse?
Criminal allegations require admissible evidence. A missing document, absent witness or procedural failure can sometimes be fatal to a prosecution.
Such failures happen, but far less often than internet mythology suggests. A minor spelling error does not automatically provide a golden ticket, and deliberately delaying a response can create a fresh offence.
For offences covered by Section 1 of the Road Traffic Offenders Act 1988, a Notice of Intended Prosecution will generally need to be sent to the driver or registered keeper within 14 days, subject to statutory exceptions. Where a vehicle is leased or hired, the first notice may go to the registered keeper or leasing company before the driver receives later correspondence.
Anyone relying on service, timing or evidence arguments should obtain advice based on the actual documents and dates.
Can a driver avoid a ban after reaching 12 points?
Under the totting-up system, accumulating 12 or more points within three years normally leads to disqualification. Government guidance states that the usual minimum is six months, with longer periods possible after previous disqualifications.
A court may consider exceptional hardship, but everyday inconvenience is not enough. The effect on other people, employment, dependants, housing, health or a business may be relevant, depending on the evidence.
Jeremy warns that the loss of a job does not automatically establish exceptional hardship. Courts hear these applications frequently and expect a clear, credible account supported by documents.
Even where a ban cannot be avoided entirely, legal representation may help reduce its length. For someone whose work depends on driving, the difference between several weeks and several months can be enormous.
Should Britain raise the motorway speed limit?
If Jeremy could change one aspect of UK speeding law, he would revisit the 70 mph motorway limit.
His argument is familiar to many petrolheads: braking, tyres, crash structures and vehicle stability have improved dramatically since the national limit was introduced. Other European countries permit higher motorway speeds in suitable conditions.
The counterargument is that drivers have not evolved at the same rate as their cars. Reaction times, distraction, traffic density, weather and differences between vehicles remain serious considerations. As Jeremy neatly puts it, the weakest component can still be the nut behind the wheel.
Could an inappropriate 20 mph limit be challenged?
A speed limit can potentially be challenged through judicial review, although this is a difficult and expensive route.
Judicial review generally examines whether a public body reached its decision lawfully, following the proper process and considering relevant matters. It is not simply an appeal based on a motorist believing the chosen limit is silly.
Local authorities are expected to consider road character, safety, surrounding development and likely compliance when setting limits. A challenge would need to focus on the legality of the decision-making process and the relevant traffic order, supported by specialist public-law advice.
Until a limit is lawfully changed or quashed, it remains the limit. Personal disagreement does not produce a temporary Autobahn.
The best advice for petrolheads
Jeremy’s closing advice is to be aware, careful and smart.
Performance can be enjoyed without treating every public road as a qualifying lap. Choose appropriate roads and conditions, remain within the posted limit and remember that the legal maximum can still be too fast for a narrow street, poor visibility or parked vehicles.
Track days, handling courses and organised driving events provide safer places to explore a car’s capabilities. On the road, observation matters more than obsessively hunting for cameras. Watch the conditions, anticipate other road users and preserve the licence that allows you to enjoy the car tomorrow.
| Important legal note |
| This article and interview provide general information and entertainment. They do not constitute legal advice. Laws, enforcement policies and individual circumstances vary. Seek advice from a suitably qualified legal professional if you face an allegation or court proceedings. |
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