Digi tacho - wheel vs hammer

We have recently started using a digi tacho and noticed that whenever you are stopped at lights or in a traffic jam then the tacho records other work rather than driving.
If you are allowed to drive for 9 hours in a day then does this mean that the hours recorded by the tacho are incorrect or can they be relied upon for total driving hours?

Owner Drivers:
We have recently started using a digi tacho and noticed that whenever you are stopped at lights or in a traffic jam then the tacho records other work rather than driving.
If you are allowed to drive for 9 hours in a day then does this mean that the hours recorded by the tacho are incorrect or can they be relied upon for total driving hours?

What is recorded by the digi-tacho are the records that may be used in court against you (if you make an error :open_mouth: ).

So the only timing you can rely on is the timing of your digi-tacho.