What a DVSA maintenance investigation looks at

What a maintenance investigation is

The Driver and Vehicle Standards Agency (DVSA) carries out maintenance investigations of operator licence holders in England, Wales and Scotland. According to its published guidance, the investigation checks whether the operator "has suitable systems, facilities and arrangements in place", and DVSA may report the outcome to the Traffic Commissioners for Great Britain.

The investigation is recorded on a maintenance investigation visit report, often called the MIVR. DVSA publishes the full set of questions and assessment criteria, and the Guide to Maintaining Roadworthiness encourages operators to use them to self-assess their own maintenance systems.

What triggers an investigation

The Guide to Maintaining Roadworthiness says a DVSA examiner's technical assessment of an operator's maintenance arrangements is normally made:

• shortly after a licence is granted;
• when advice is needed on an operator's application to vary its licence;
• when evidence of maintenance problems comes to light, such as prohibition notices, poor annual test results or complaints about smoky vehicles that the operator has not satisfactorily answered;
• when the licence is being reviewed for other reasons.

Roadside history feeds into this. DVSA uses the Operator Compliance Risk Score (OCRS) to decide which vehicles to stop, so an operator with a high score is more likely to be checked at the roadside, and every prohibition adds to the evidence. Prohibitions an examiner marks "S" indicate, in DVSA's words, a "significant failure of roadworthiness compliance". The DVSA enforcement sanctions policy adds that where the nature, number or seriousness of offences suggests "systemic failure in the management of the operation", examiners will investigate with the operator and may report to the Traffic Commissioner.

DVSA can also review records without visiting. The OCRS guidance explains that DVSA can ask for copies of maintenance and drivers' hours records and check them remotely, recorded as a "desk-based assessment". A site visit to check drivers' hours or maintenance records is recorded as a "fleet assessment".

What the examiner checks

The maintenance investigation questions are grouped into 14 sections:

1. Operator legal entity, checked against Companies House and VOL
2. Condition of vehicles examined at the fleet check
3. Operating centre use and parking
4. Inspection and maintenance records
5. Driver defect reporting
6. Maintenance facilities and arrangements
7. Vehicle emissions
8. Wheel and tyre management
9. Load security (HGV operators)
10. Prohibition assessment
11. Security requirements
12. Previously reported shortcomings, conditions and undertakings
13. Transport manager or responsible person
14. Response to the request for explanation

The fleet check

Where possible the examiner inspects vehicles and trailers unannounced. The recommended minimum is one vehicle for a fleet of 1 to 5, three for 6 to 50, five for 51 to 100 and 5% above 100, with trailers counted in the fleet size. The examiner can inspect more if circumstances require.

The records

The examiner samples vehicle files, a file being "all relevant maintenance documents for a vehicle or trailer". If no prohibitions have been issued in the last 15 months, detailed analysis covers the last 12 months. If there have been prohibitions, it covers the last 15 months, and the examiner should check every prohibition file where possible. The sample grows if significant problems appear. Expect to be asked for:

• a manual or digital forward planner; for a wall chart, DVSA expects inspections, annual tests and calibration dates at least six months ahead;
• safety inspection records for at least 15 months, including vehicles since removed from the licence, each completed, legible and signed off as roadworthy;
• brake performance evidence from every safety inspection, whether a laden roller brake test, an electronic braking performance monitoring report or a decelerometer test with temperature readings;
• driver defect reports showing the vehicle, date, defect, who reported it and to whom, how it was assessed and the repair;
• vehicle off road (VOR) records, which the examiner may compare with tachograph, telematics or scheduling data;
• maintenance contracts, and how you check the quality of your contractor's work;
• your MOT first-time and final pass rates, and how you respond to failures.

The transport manager

Question 13 asks whether the transport manager is correctly specified, has kept up continuing professional development, and has shown "effective and continuous management control of the operation" and integrity. Effective control is rated satisfactory, partial control mostly satisfactory and ineffective control unsatisfactory. No control, or an issue of integrity, is reported to the Traffic Commissioners.

The outcome ratings

DVSA's guidance sets out four possible outcomes for each question section:

Not every question uses all four ratings. The Guide to Maintaining Roadworthiness summarises the overall position more simply: the examiner will report whether the maintenance arrangements are satisfactory, and "any deficiency may result in an unsatisfactory report".

Request for explanation

After an unsatisfactory finding, the operator must explain what it will do. The response is due within 14 days of receiving the report, with a further 7 days allowed only exceptionally. DVSA accepts evidence, such as a signed maintenance contract or missing inspection records, and credible assurances, such as introducing laden roller brake tests at every inspection. Depending on the reply, DVSA may close the case, refer it to its Remote Enforcement Office for deferred checks, or send the report and the operator's explanation to the Traffic Commissioners. An unsatisfactory response, or no response, leads to a report.

Effect on OCRS

The OCRS guidance allocates roadworthiness points to fleet assessments: 100 for an unsatisfactory result reported to the Traffic Commissioner, 50 for unsatisfactory, and none for mostly satisfactory or satisfactory. Desk-based assessments carry smaller amounts. Drivers' hours assessments carry separate traffic points.

When the report reaches the Traffic Commissioner

A report does not automatically mean a public inquiry. Statutory Document 10 describes alternatives, including a senior team leader interview, and notes that a later DVSA desk-based assessment showing satisfactory arrangements can be relevant. If a hearing is called, the Commissioner makes findings as at the date of the inquiry and takes improvements into account. A recent follow-up inspection by DVSA may be part of the evidence.

Traffic Commissioner-requested audits

An independent operator compliance audit is different from a DVSA investigation. It is commissioned and paid for by the operator, often because it has given an undertaking to the Traffic Commissioner. Statutory Document 10 gives the example of an audit "in 6, 9 or 12 months" with the report and remedial action sent to the Office of the Traffic Commissioner within a month.

The Traffic Commissioners' Operator Compliance Audits guidance, updated in August 2026, sets the expected standard:

• the auditor must be independent, and payment "cannot be linked to the successful outcome of an audit";
• audits should generally be done in person at the operator's premises;
• maintenance samples should cover at least four scheduled safety inspections, and driver records not less than the previous three months;
• the framework covers management structure, repute, operating centres, the transport manager, driver management, drivers' hours and working time, vehicle specification, maintenance and, where relevant, dangerous goods;
• where no evidence is available the auditor should say so, because phrases such as "the operator verbally advised that" carry little weight;
• the auditor signs a declaration that the report reflects their true professional opinion.

The guidance does not prescribe a rating scale. It warns that an inadequate audit may not be accepted by a Traffic Commissioner.

How to prepare

1. Work through DVSA's published questions yourself and note any section you would rate below satisfactory.
2. Check your OCRS report, prohibition history and MOT results, and be ready to explain the root cause of each failure.
3. Make sure every vehicle file for the last 15 months is complete, including brake test evidence and signed roadworthiness declarations.
4. Match defect reports against safety inspections: defects a driver should have spotted but did not report will be noticed.
5. Confirm your inspection frequency and maintenance provider on VOL match reality.
6. Ask the transport manager to explain how they monitor the system, with evidence.
7. If a report arrives, diarise the 14-day deadline and answer every shortcoming with evidence or a dated commitment.

Roadworthy can produce an indexed compliance pack for an investigation or inquiry from the records it holds, alongside defect tracking from report to sign-off and an inspection and brake-test calendar with advance notice.

This guide is general information, not legal advice. DVSA and Traffic Commissioner guidance changes from time to time, so check the current versions on GOV.UK.