Understanding tachographs and tachograph rules

A tachograph is a device fitted to commercial vehicles that records driving time, rest periods, breaks and other relevant data. It exists to regulate drivers' working hours and to demonstrate compliance with the drivers' hours rules and the Working Time Directive. Tachographs are either analogue or digital, and both types must be calibrated — usually every two years — to remain accurate and legal.

Digital units use a series of symbols to indicate activities such as driving, rest, other work and availability. Drivers must be familiar with these symbols, and confident using the mode switch, so their records reflect what actually happened during the day. Get the mode wrong and the record is wrong — which is exactly what an examiner looks for at the roadside.

Who the rules apply to

In the UK, tachograph rules are governed by the retained EU drivers' hours regulations. They apply to drivers of goods vehicles with a maximum permissible weight over 3.5 tonnes and to passenger-carrying vehicles with more than nine seats. The aim is consistent across both: prevent driver fatigue and promote road safety. For a full breakdown of the limits themselves, see our guide to HGV drivers' hours.

Analysis software and data downloads

Analysis tools such as Tachomaster and TruTac let you download and interpret tachograph data, generating reports that reveal driver activity, infringements and patterns of behaviour. Analogue units recorded onto paper discs (charts); digital units record onto a smart driver card and onto the vehicle unit, with data pulled off using a download device. Frequent, disciplined downloads are the foundation of good compliance — a point we cover in detail under tachograph minimum standards. If you would rather hand the analysis over entirely, our tachograph analysis service manages downloads, reporting and infringement letters for you.

How to apply for a tachograph card

There are several card types depending on your role — driver, company and workshop cards. To obtain one:

1. Identify the card you need based on your role.
2. Complete the application form from the GOV.UK website or DVLA.
3. Provide documentation — proof of identity, address and, where relevant, employment.
4. Pay the fee, which varies by card type.
5. Submit your application by post or in person.
6. Wait for delivery — typically 15 to 28 working days, with paid options for faster turnaround.

Common tachograph problems

Most issues stem from incorrect use or calibration faults, both of which produce inaccurate records. Forgetting to switch mode, failing to make manual entries after a card-out period, and letting calibration lapse are the usual culprits. Drivers and transport managers should treat the tachograph as a daily discipline, not an afterthought. Where exemptions might apply, read our guide to tachograph exemption before assuming a vehicle is out of scope.

Getting expert support

Tachograph rules change, and penalties for non-compliance range from fines to licence action and, in extreme cases, prosecution. If you want a second pair of expert eyes on your records, your team's training, or your analysis process, our consultants can help — get in touch for a free, no-obligation chat.