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Average Speed Fine

How to appeal an A14 average-speed speeding fine

Appeal a Notice of Intended Prosecution from A14 average-speed cameras, including statutory grounds and the magistrates' court route.

Quick facts

Issued by
Cambridgeshire Police, Suffolk Police or Northamptonshire Police
Appeal to
Magistrates' Court via NIP response and court summons
Discount window
No discount; £100 + 3 points fixed penalty if accepted
Formal challenge window
28 days to return the s.172 Notice and elect court
Standard fine
£100 fixed penalty + 3 points, or up to £1,000 on summary conviction
Fastest appeal route
Challenge the NIP on the 14-day rule under s.1 Road Traffic Offenders Act 1988 if served late

The A14 is the major east-west corridor connecting the M1/M6 at Catthorpe to Felixstowe via Cambridge, Newmarket and Bury St Edmunds. Average-speed cameras have been used heavily during long roadworks, including the Cambridge to Huntingdon improvement scheme completed in 2020 which kept long average-speed sections in place for years. They are also deployed permanently at junctions and accident clusters. Enforcement varies by force area: Cambridgeshire Police covers from Catthorpe to Newmarket Heath, Suffolk Police covers Newmarket to Felixstowe, and Northamptonshire Police handles the M1 junction sections. The legal framework is the same: section 89 of the Road Traffic Regulation Act 1984, with section 1 of the Road Traffic Offenders Act 1988 (14-day NIP rule) and section 172 of the Road Traffic Act 1988 (driver identification). Average-speed enforcement on the A14 has been particularly tight during temporary limits in roadworks, where lower limits of 40 or 50 mph apply.

Grounds that work for A14 speeding fines

NIP not served within 14 days

Section 1 of the Road Traffic Offenders Act 1988 requires the Notice of Intended Prosecution to be served on the registered keeper within 14 days of the offence. Compare the date of offence to the date you received the NIP. If you have moved house since the offence, the prosecution can rely on service to your DVLA address, so always update DVLA promptly. If the NIP is dated more than 14 days after the offence and you have not moved, that is a clean ground to invite the relevant force to withdraw. If they do not withdraw, the magistrates' court will dismiss the charge if the prosecution cannot prove service within the statutory window.

Temporary speed limit signage in roadworks

During roadworks on the A14, average-speed cameras commonly enforce a temporary limit of 40 or 50 mph. The temporary limit is only enforceable if the signage complies with the Traffic Signs Regulations and General Directions 2016 and the relevant Temporary Traffic Regulation Order. If signs were missing on your section, contradictory between gantries, or removed before the limit was officially lifted, you may have a defence. Request the police footage and the TTRO covering the date of offence under disclosure if you elect court. Take photographs of the section if you can return safely.

Camera Type Approval and calibration

Average-speed cameras must be Type Approved under section 20 of the Road Traffic Offenders Act 1988 and calibrated within the manufacturer's certified interval. Ask, when you respond to the NIP, for the Type Approval Certificate and the calibration certificate covering the date and time of the alleged offence. If either is missing, expired, or in the wrong name, the evidence may be inadmissible. This is a technical defence that works best when you elect court and request disclosure under the Criminal Procedure Rules. Camera evidence is usually robust, but disclosure failures do happen.

Driver identification on shared vehicles

Section 172 of the Road Traffic Act 1988 requires the registered keeper to name the driver. If the vehicle is shared between several drivers (company pool car, family vehicle, hire firm), the defence of reasonable diligence under section 172(4) is available. Document who could have been driving on the relevant date and time and the steps you have taken to narrow it down. If you cannot identify the driver despite diligent enquiry, state that explicitly in the s.172 response. The burden of proving diligence is on you, so keep records of fuel cards, telematics, rotas and conversations.

Speed marginally over the limit

If the recorded average speed is only marginally above the limit, raise the NPCC enforcement guidelines (10 percent + 2 mph tolerance) in your reply. The relevant force does not have to follow the guidelines, but the magistrates do take them into account. Combined with a clean licence and a credible explanation for being on that section of the A14 at that speed, this can support a speed awareness course offer or a band-A fine if you elect court. It is rarely a winning ground in isolation, but it strengthens an otherwise borderline case.

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Local detail: A14

  • The A14 runs 127 miles from Catthorpe (M1/M6) to Felixstowe via Cambridge and Newmarket.
  • It carries around 85,000 vehicles a day at its busiest, near Cambridge.
  • The Cambridge to Huntingdon improvement scheme was completed in 2020 after years of average-speed enforced 40 mph limits during construction.
  • Permanent average-speed sections exist at known collision clusters including the Girton Interchange.
  • Cambridgeshire Police, Suffolk Police and Northamptonshire Police share enforcement along the corridor.
  • Speed awareness courses are administered by the relevant force through the National Driver Offender Retraining Scheme.
  • NIPs are issued by the Central Ticket Office of the relevant force.

Frequently asked questions

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