The first time I watched a DVSA analyst pull apart a driver card, I expected them to be looking at driving time and rest periods. That's what tachograph records are for. That's what the infringement report flags.
What they were actually looking at was the pattern. Not the individual entries -- the shape of a working week. The consistency of speeds against road type. The timing of card insertions relative to vehicle movement. The gap between what the mode switches said and what the GPS track showed.
Because tachograph records can be manipulated. And DVSA know what manipulation looks like.
What counts as a tachograph offence
The law on this is in section 99(5) of the Transport Act 1968. Making a false entry in tachograph records, or altering an entry with intent to deceive, is a criminal offence. The penalties are tiered: on summary conviction, a fine; on conviction on indictment, imprisonment for up to two years.
That two-year maximum is not theoretical. DVSA bring prosecutions under this provision. They don't do it for every infringement -- that's what the graduated fixed penalty scheme is for. They bring criminal prosecutions for systematic manipulation: records that appear to show legal compliance but have been deliberately altered to conceal illegal driving patterns.
There's also an offence of using a device to falsify records -- a magnetic device on an analogue tachograph head, for example, or software manipulation of a digital card. That's a separate and more serious charge. The 1968 Act provision covers the record itself; interfering with the equipment that generates it brings in additional legislation.
What manipulation looks like
I'm not going to write a how-to. What I will say is that analysis software -- the tools DVSA and TMs use to review downloaded data -- looks for patterns that don't make physical or logical sense. A few examples of what flags in an analysis report:
Card removal during driving. A driver who pulls their card from the slot for periods of time while the vehicle is moving creates a gap in the card record. The vehicle unit, however, still records movement. Gaps in the card record that coincide with vehicle unit driving events are a clear discrepancy that analysis tools flag automatically.
Mode switches that don't match the timeline. A driver who switches to rest mode while still in a loading bay -- or who switches to availability when the GPS track shows them stationary for three hours in a location that isn't a known customer or rest area -- creates an anomaly. Manual entries that don't match vehicle unit data are another flag.
Country entry manipulation. Under EU 561, driving time and rest rules are recorded against country of operation. Incorrect country entries -- claiming to be in a country where different rules apply when GPS data shows otherwise -- is a form of manipulation that analysis software tracks against the position record.
Analogue chart folding. On older vehicles still running analogue tachographs, a chart that's been physically manipulated -- folded, marked, or altered -- shows differently from a normal print. Examiners are trained to recognise the physical characteristics of a genuine chart versus one that's been interfered with.
None of this is invisible. Modern analysis tools and trained DVSA analysts are specifically looking for these patterns. The idea that you can quietly manage a few extra hours into compliance by adjusting the records is a misunderstanding of how thorough the analysis has become.
How DVSA discover it
Most manipulation isn't caught at a roadside check. Roadside officers can pull a basic infringement report, but deep pattern analysis happens in DVSA's enforcement directorate and with the Traffic Commissioner's office when a case is built.
It typically comes to light in one of three ways: a roadside stop where something obvious flags during the initial review; a premises inspection where the operator's downloaded records are analysed in bulk; or as part of a broader investigation triggered by an accident, a whistleblower, or a previous infringement that put the operator under closer scrutiny.
The bulk analysis at a premises inspection is where systematic manipulation gets caught. A single card, a single day -- possibly missed. Six months of downloaded card data, cross-referenced against vehicle unit downloads for the same period, with the analysis software looking for correlations and anomalies -- that's where a pattern becomes visible.
If your vehicle unit and driver card records don't align consistently, it will show up.
The operator's liability
Transport managers and operators can face criminal charges alongside drivers if they knew about manipulation or directed it. A TM who instructed drivers to adjust records, who saw manipulation in analysis reports and ignored it, or who created a working pattern that made it impossible for drivers to be compliant without manipulation -- the liability doesn't sit with the driver alone.
I've seen a TM lose their Transport Manager CPC repute in a Traffic Commissioner hearing because drivers at their fleet had been manipulating records, and the TC found that the TM's infringement review process was insufficient to catch it over a six-month period. The TM didn't direct the manipulation. But they ran a compliance process that failed to detect it. The TC took the view that a competent TM should have seen the pattern.
The standard of care isn't just running an infringement report once a month. It's understanding what the report is showing and recognising anomalies that a trained analyst would flag.
What drivers should know
If a depot manager, a TM, a dispatcher, or anyone else at an operator tells you to adjust your records -- add a rest period that didn't happen, change a mode entry, pull your card while driving -- that's asking you to commit a criminal offence. The two-year maximum on indictment applies to you, not just to them.
The defence that you were told to do it is not a defence to the offence of making a false record. It might be relevant to sentencing or to a subsequent civil claim against the operator, but it doesn't remove your criminal liability for the record itself.
If you're being pressured to falsify records, document it. Keep your own notes of what you were asked and when. Raise it formally if you can. The DVSA has a confidential reporting line. So does the Traffic Commissioner's office. Neither of them will ignore a report of systematic record manipulation.
Genuine infringements vs manipulation
A genuine infringement -- missed a rest by 20 minutes because traffic on the M6 was stationary and I misjudged the distance -- is a different situation. That's a graduated fixed penalty. It's on your infringement report. The TM reviews it, signs it off, you review it, sign it off. It's logged. Done.
The distinction between a genuine infringement and a falsified record is intent. DVSA and the TC can generally distinguish them through the pattern of infringements and the nature of the records. A driver who has occasional genuine infringements and a consistent record is not the same profile as one whose records show implausible patterns that happen to always result in legal compliance.
Keep your records honest. A genuine infringement is recoverable. A criminal conviction for falsification is not.
If you're a TM who wants a cleaner view of your fleet's real compliance before someone else analyses it for you, ShiftOwt tracks 561 and WTD compliance automatically from driver input -- the kind of running picture that lets you spot anomalies before they accumulate. 5.99 per month for drivers, agency pricing on request.