The A90 runs from Edinburgh to Fraserburgh and has long average-speed enforcement sections, particularly between Dundee and Stonehaven and at known accident clusters such as Laurencekirk. The Aberdeen-Dundee average-speed scheme was introduced in 2017 by the A90 Safety Group and Transport Scotland, and the system has been credited with significant casualty reductions. Enforcement is by Police Scotland, with prosecutions referred to the Procurator Fiscal and any contested cases heard in the Justice of the Peace Court. The substantive offence is the same as in the rest of Great Britain (section 89 Road Traffic Regulation Act 1984, with section 1 Road Traffic Offenders Act 1988 for the 14-day NIP rule and section 172 Road Traffic Act 1988 for driver identification), but the procedure is Scottish. You receive a Conditional Offer of Fixed Penalty rather than an English-style FPN and you respond within 28 days.
Grounds that work for A90 speeding fines
NIP not served within 14 days
Section 1 of the Road Traffic Offenders Act 1988 applies in Scotland and requires the Notice of Intended Prosecution to reach the registered keeper within 14 days of the offence. Service to the DVLA address is good service even if you have moved, so keep DVLA records up to date. If the NIP is dated more than 14 days after the offence and your address is correct, the prosecution is barred. Write to Police Scotland's Camera Safety Unit citing section 1 RTOA 1988 and ask for the Conditional Offer to be withdrawn. If they refuse and the case goes to the Justice of the Peace Court, raise the time limit as your first issue.
Average-speed Type Approval and calibration
The A90 average-speed cameras must be Type Approved under section 20 of the Road Traffic Offenders Act 1988 and calibrated to the manufacturer's certified interval. When you reject the Conditional Offer, ask the Camera Safety Unit for the Type Approval Certificate and the calibration certificate covering the date and time of the alleged offence. If either is missing, expired or not specific to the camera pair that detected your vehicle, the evidence may be inadmissible. The Procurator Fiscal will often withdraw a prosecution rather than risk a not-proven verdict on technical evidence issues.
Signage and limit changes through the corridor
The A90 between Dundee and Stonehaven includes 70 mph dual carriageway sections and 60 mph single-carriageway transitions, with local 40 and 50 mph reductions at junctions. The Traffic Signs Regulations and General Directions 2016 require correct repeater signs at appropriate spacing. If your alleged offence relates to a transition section where signage may have been ambiguous, request the signage diagrams from Transport Scotland and Police Scotland for the date of offence. The Justice of the Peace Court will dismiss where the lower limit was not properly displayed for the relevant section.
Driver identification on shared or company vehicles
If the vehicle was driven by more than one person, section 172(4) of the Road Traffic Act 1988 allows a defence of reasonable diligence. Document the steps you have taken to identify the driver: work rota, family calendar, telematics or tracker data, fuel card transactions. The defence is narrow and you must prove the diligence; it is not enough simply to say you do not remember. If you genuinely cannot identify the driver, state that with supporting evidence in the s.172 response and prepare to argue the diligence point at the Justice of the Peace Court if challenged.
Marginal speed and mitigation for course or fine reduction
Police Scotland follows the NPCC speed enforcement guidance, with a tolerance of 10 percent plus 2 mph before prosecution. If your recorded speed is within the tolerance, raise that in your response. Even if not, a marginal excess speed with a clean licence is good mitigation. Speed awareness courses are offered in Scotland through the National Driver Offender Retraining Scheme partner; eligibility is the same as in England. Otherwise, the Justice of the Peace Court applies fines and points by reference to speed bands similar to the English Magistrates' Court Sentencing Guidelines.
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Local detail: A90
- The Aberdeen-Dundee A90 average-speed scheme launched in 2017, covering 50 miles between the cities.
- Police Scotland's Camera Safety Unit operates the enforcement system.
- Casualty data from Transport Scotland shows significant reductions in fatal and serious collisions since 2017.
- Local accident clusters at Laurencekirk and Stonehaven have had additional fixed cameras since.
- Limit transitions include 70 mph dual carriageway, 60 mph single carriageway, and 40 or 50 mph at junctions.
- Prosecutions are referred to the Procurator Fiscal at Aberdeen or Dundee Sheriffdom depending on offence location.
- Speed awareness courses are administered by Police Scotland through their NDORS partner.