A DDD file is the standard digital record created by a digital tachograph or a driver card, and it is the core of tachograph record-keeping in every transport company. It holds data on drivers' driving, working and rest times, together with driver and vehicle information that inspectors from the Polish Road Transport Inspection (ITD) and the Polish National Labour Inspectorate (PIP) require during checks. Downloading, reading and archiving DDD files on time is a legal obligation of the carrier and the basis for correct working time settlements. We also analyze DDD files for fleets up to 3.5 t, where we handle payroll for van drivers covered by the new tachograph requirement.
Key takeaways
Looking for information about DDD files? In this article, you will learn:
- What DDD files are;
- What DDD files are used for and what the .DDD format is;
- How often and from where DDD files must be downloaded;
- How to open a DDD file;
- How long DDD files must be stored and what penalties apply in Poland if you fail to comply.
What is a DDD file and what is it used for?
A DDD file is a digital data file generated by a digital tachograph or a driver card that contains information about driving, working and rest times.
DDD files are used to settle drivers' working time, to check compliance with the rules and as evidence during roadside checks and inspections at company premises. They also make it possible to download tachograph data remotely, download files regularly and archive them.
Based on DDD files, companies also analyze infringements, optimize their processes and prepare documentation for enforcement authorities.
What does a DDD file contain?
What data does a DDD file contain?
A DDD file contains data such as:
- Driver data;
- Vehicle data (VIN, registration number);
- Driving, working and rest times;
- Speed;
- Tachograph events and faults;
- Activity history.
A DDD file downloaded from a driver card also includes card details such as the cardholder's name, the card number and the exact dates and times of each recorded activity.
The .DDD format
The .DDD format is the standard digital file format used by digital tachographs and driver cards to record working time and driver activities. A .DDD file holds data on driving, rest, speed and events, as well as driver and vehicle details. The data are digitally signed, so any later modification of the file can be detected.
The DDD format follows EU tachograph standards and can only be read with dedicated tachograph analysis software.
Downloading DDD files
Downloading DDD files means reading data from a digital tachograph or a driver card and saving it in DDD format on a storage medium. Downloads can be done manually with a card reader or a download key, or automatically through telematics systems.
Regular downloading of DDD files is a legal obligation of the transport company. It serves to archive the data and prepare documentation for inspections.
How often must DDD files be downloaded?
Under Commission Regulation (EU) No 581/2010, data must be downloaded:
- from the driver card at least every 28 days;
- from the vehicle unit (the tachograph itself) at least every 90 days.
You may come across the figure of 56 days. Since December 31, 2024, drivers must be able to present records for the current day and the previous 56 days during a roadside check, and new driver cards store at least 56 days of data. This rule concerns what the driver presents at the roadside. It does not change the download intervals, so the company still has to download driver card data at least every 28 days.
Remote download of DDD files
Remote download of DDD files allows data to be read from the digital tachograph automatically, without physical access to the vehicle. With telematics modules, companies can download data remotely, archive files on an ongoing basis and read DDD files almost in real time. This makes regular downloads easier and minimizes the risk of penalties for missing or outdated data.
Where do DDD files come from?
A DDD file can be downloaded directly from:
- The digital tachograph (vehicle unit);
- The driver card.
DDD files are downloaded using a card reader, a download key or a telematics system. Their content always comes from devices that record drivers' working time, and the files themselves are the official activity record required by transport regulations.
DDD file from a digital tachograph
A digital tachograph generates a DDD file with a complete set of data on the vehicle, speed, driving time and technical events. Data are downloaded from the tachograph by physically connecting a download device or remotely, using automatic download systems. Vehicle unit files are the basis for fleet control and archiving.
DDD file from a driver card
A driver card stores a DDD file with information on the activities of a specific driver, including working time, rest periods and driver identification. Data are downloaded from the driver card with a card reader or remote systems. This information is essential for working time settlements and for inspection documentation.
How to open a DDD file?
To open a DDD file, you need dedicated tachograph analysis software. Standard programs such as Excel or Word cannot read this format correctly. Dedicated applications convert the data into readable reports on working time, driving time and infringements.
Reading DDD files
Reading DDD files means analyzing the data stored in DDD format with digital tachograph software. It lets you check driver activities, vehicle history, events and faults recorded by the system. As a result, transport companies can monitor compliance and prepare documentation for inspections. To interpret the data correctly, you also need to understand what the symbols on a digital tachograph mean.
DDD files and the law
DDD files must be archived in line with EU and Polish rules on digital tachographs. A transport company must download data from tachographs and driver cards regularly and make it available on request to enforcement authorities such as the Polish Road Transport Inspection (ITD) or the Polish National Labour Inspectorate (PIP). Missing or outdated DDD files can lead to financial penalties and administrative liability.
Deadlines for downloading and storing DDD files
Storing DDD files
DDD files must be archived securely for at least 12 months. The files should be kept in DDD format, protected against loss and easily accessible for inspections. Correct archiving of DDD files is a company obligation and part of the documentation of drivers' working time.
Penalties for missing or late DDD files
DDD files and penalties in Poland
DDD files must be downloaded and archived in line with the rules on digital tachographs and driver cards. Missing or late downloads expose the carrier to financial penalties under the Polish Road Transport Act:
- failure to download driver card data on time: PLN 500 per driver;
- failure to download vehicle unit data on time: PLN 500 per vehicle;
- failure to keep downloaded data for at least one year: PLN 500 for each day, for each driver.
What is a DDD file? Summary
DDD files are the official record of driver and vehicle activity in road transport, which is why downloading, reading and storing them regularly is crucial for every transport company. A DDD file is not only a tool for monitoring working time, but also the basis for inspection documentation and payroll. Managing DDD files correctly minimizes the risk of financial penalties and ensures full compliance with the rules. If you'd rather not download and analyze files from your trucks yourself, Evotax handles tachograph-based driver settlements for fleets over 3.5 t.
If you run a transport company and need support with DDD files, drivers' working time settlements or accounting for transport, the Evotax team is here to help! Contact us, tell us what your challenge is, and our specialists will take care of the rest.
DDD files - Frequently asked questions
Below, we've gathered the most frequently asked questions about DDD files, together with our answers. If your question isn't here, contact us and our specialists will be happy to help!
Downloading DDD files means reading data from a digital tachograph or a driver card and saving it in DDD format on a storage medium or in a telematics system. It can be done manually with a card reader or automatically through remote download.
DDD files are governed by EU and national rules on digital tachographs and drivers' working time, including Regulation (EU) No 165/2014 and Commission Regulation (EU) No 581/2010. These rules set how often data must be downloaded, how long it must be stored and the obligation to make DDD files available to enforcement authorities on request.
Yes. During a roadside check, inspectors from the Polish Road Transport Inspection (ITD) or other authorities may request access to the data stored in the tachograph or on the driver card. Failure to provide up-to-date data may result in a financial penalty.
Data must be downloaded from the driver card at least every 28 days and from the digital tachograph (vehicle unit) at least every 90 days. Downloaded data must be stored for at least 12 months.
No. Since December 31, 2024, drivers must be able to present records for the current day and the previous 56 days during a roadside check. The download obligation for companies has not changed: driver card data must still be downloaded at least every 28 days.
Yes. DDD files are the official record of digital tachograph data and are accepted during roadside checks and inspections at company premises. Authorities use them to verify working time, rest periods and possible infringements.
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