The '10% Speeding Buffer' Myth: Why London Drivers Are Losing Their Licences

Drivers across London are risking their licences by relying on "outdated internet folklore" and a fundamental misunderstanding of traffic legislation, a leading motoring law specialist has warned.

Solicitor Shazia Ali, of Scarsdale Solicitors, specialises in motoring offences. She says motorists are routinely blindsided when penalty notices arrive through their letterbox, often under the mistaken belief that minor infringements are permitted under the law.

Under the Road Traffic New Drivers Act 1995, people in their first two years of driving face an automatic revocation of their licence if they accumulate six penalty points. For more experienced motorists, accumulating 12 points via 'totting-up' results in a ban.

To help drivers protect their licences, Ali has addressed the three most common myths surrounding UK road traffic laws and set out the strict legal reality.

Common Speeding and Device Myths Debunked

Myth 1: The '10% Plus 2' Speeding Buffer

One of the most widespread beliefs among British motorists is that they are legally entitled to a speed limit buffer, commonly quoted as 10% plus 2 mph.

However, this buffer is a myth.

"As a matter of law, the legal tolerance for speeding in the UK is zero," says Ali.

The primary speeding offence is governed by Section 89 of the Road Traffic Regulation Act 1984, which dictates that exceeding the speed limit by any margin constitutes an offence. The widely quoted "10% plus 2" figure stems purely from enforcement guidelines issued by the National Police Chiefs' Council (NPCC) to aid officer discretion and account for mechanical variances in older equipment.

These guidelines carry no statutory weight. Police forces remain entirely within their legal rights to prosecute drivers travelling at 31 mph in a 30 mph zone, with several forces having already adopted stricter enforcement stances.

Myth 2: Average Speed Cameras Can Be Evaded

Ali says: "Tactics designed to evade older, standalone Gatso cameras—such as braking sharply right before the lens or changing lanes—are completely ineffective against modern camera systems.

"Modern SPECS and Vector average speed camera systems utilise Automatic Number Plate Recognition (ANPR) to track a vehicle's exact passing time between entry and exit cameras placed several miles apart. Because the distance remains constant, basic physics calculates the vehicle's average speed over the entire stretch."

And lane-swapping is futile as digital systems track registration plates across all lanes seamlessly. System manufacturers cite a margin of error of just 0.1%, meaning temporary deceleration before a camera point will not prevent a Notice of Intended Prosecution (NIP) if the overall average speed exceeds the limit.

Myth 3: Briefly Touching a SatNav or Mobile Device is Allowed

Ali says that the fastest route to an immediate six-point penalty is breaching mobile phone laws, which were tightened significantly to close previous legal loopholes.

"Under current regulations, it is illegal to hold or use a mobile phone, SatNav, tablet, or any data-transmitting device for any reason while driving. This includes offline tasks such as typing a postcode, scrolling through music, or taking video footage.

"Crucially, the law applies the moment a vehicle's engine is running."

Drivers cannot use devices while:

• Stopped at red traffic lights

• Held up in gridlock traffic

• Stationary while automatic start-stop technology has temporarily cut the engine

If a vehicle is in the flow of traffic, physically touching a device completes the offence.

Driver Compliance Rules and Legal Appeals

The Expert's Six-Point Compliance Checklist

To help drivers remain compliant, Ali recommends adopting a standard pre-journey routine:

1. Secure the Device: Smartphones used for navigation must be mounted in a dedicated dashboard cradle or windscreen mount.

2. Clear the Sightline: Position cradles outside the primary field of vision to avoid fines and three penalty points for obstructed views under Highway Code rules.

3. The Hands-Off Rule: Input all route details before starting the ignition. To adjust navigation mid-journey, drivers must pull over and park legally and safely first.

4. No 'Passenger' Exceptions: Holding a phone to display maps or media for passengers is prohibited. Accompanying drivers supervising a learner are also bound by the same mobile device bans.

5. Utilise Voice Control: Hands-free operation via Bluetooth or voice activation is permitted, provided the device is not physically handled at any stage.

6. Maintain 'Proper Control': Police retain the authority to stop and prosecute drivers for "driving without due care and attention" if a legally mounted, hands-free device causes a distraction.

Notice Defences and Legal Appeals

When a digital camera detects speeding, the police must issue an NIP to the registered keeper within 14 days of the alleged offence. Failing to respond to the subsequent Section 172 notice identifying the driver carries an independent six-point penalty.

While technical and digital defences exist, Ali cautions that appealing against modern camera evidence is exceptionally difficult due to Home Office Type Approval (HOTA) standards and annual device calibrations.

Legitimate grounds for appeal typically rely on procedural errors, such as an NIP arriving outside the statutory 14-day window without cause, or factual errors like cloned registration plates.

Motoring specialists advise drivers to consult professional legal counsel immediately rather than relying on internet ‘loopholes’ or informal advice. Unsuccessful court appeals frequently result in substantially increased court costs, higher fines, and avoidable driving bans.