The Tachograph: A Practical Guide for HGV Drivers

The tachograph is the black box that proves you drove your shift legally. It records your driving, breaks and rest, and it is the first thing an enforcement officer looks at. Used properly it is straightforward. Used carelessly it is where most drivers pick up infringements, so getting into good habits early saves you fines and awkward conversations.

What it is and what it records

A digital tachograph is made of two parts: the vehicle unit built into the dashboard, and your personal driver card (your digicard), which you insert at the start of a shift. The unit records four activities:

• Driving: set automatically the moment the vehicle moves.
• Other work: loading, unloading, paperwork, anything that is work but not driving.
• Availability (POA): periods of availability, such as waiting at a bay where you know in advance you will be idle.
• Rest: breaks and daily or weekly rest.

It also logs speed and distance. All of this is stored on the card and in the vehicle unit, and both can be downloaded and read by DVSA.

Using the mode switch

When you stop driving, you have to tell the tachograph what you are doing by switching modes manually. Driving is automatic, but the other three are on you. The symbols are standard across every unit:

The most common mistake is leaving the mode on "other work" during your break, which then does not count as a break, or forgetting to switch to rest at the end of the day. Get into the habit of setting the mode every single time the wheels stop.

Manual entries

When you insert your card, the unit asks whether you want to add activities for the time since you last removed it. This is where you record anything you did away from the vehicle: rest overnight, work on another vehicle, a ferry crossing. Take the time to enter these accurately. A gap in your record reads as an unexplained period and enforcement will ask about it.

Records you must carry

You must be able to produce your records at the roadside on demand. For international journeys the requirement is the current day plus the previous 56 days, a change that came into force at the end of 2024 (it was 28 days before). That means your card data, plus any printouts and manual records covering days you drove without the card or on an analogue vehicle. Keep printouts tidy and legible; a smudged roll is not a defence.

If you forget or lose your card

Under EU rules you should not drive without your driver card. If it is lost, stolen or malfunctioning, you can still drive but you must:

• Take a printout at the start of the journey and write your name and card or licence number on it.
• Take a printout at the end of the journey and do the same.
• Record your activities manually on the printout for anything the unit could not capture.
• Report a lost or stolen card and apply for a replacement within seven days.

Smart Tachograph 2 and the 2026 changes

Digital tachographs have gone through generations. The current standard is the Smart Tachograph 2, which adds features such as more precise position logging via satellite at the start, end and every three hours of accumulated driving. It became mandatory on new vehicles registered for international use, and older vehicles running international journeys have had to be retrofitted on a rolling timetable. The final deadline to replace first-generation smart tachographs on international vehicles falls in 2026. If you drive internationally, check the unit in your cab is compliant, because enforcement across the EU is strict on this.

For purely domestic GB work the retrofit deadlines do not bite in the same way, but if there is any chance your operator sends you across a border, the vehicle needs the right unit.

Good habits that keep you clean

• Insert your card before you move and remove it only at the end of your shift.
• Switch modes every time you stop driving.
• Do your manual entries properly when prompted.
• Download your card regularly; agencies and operators usually require it every 28 days at most.
• Keep your printouts and know you can pull 56 days if asked on international work.

The tachograph is not out to catch you. It simply records the truth. Drive to the hours rules and use the unit correctly, and it becomes your best evidence that you did everything right.