I see. There is no such distinction over here - if you are carrying goods commercially, you have to have a tachometer, full stop. Also, while the driver can be given a ticket for certain things(speeding mostly) working over hours or any issues with the truck will result in a massive fine for the company(one of the trucks carrying goods for us was fined in Germany recently for 2500 Euro because one side had a small bulge - that's not acceptable). The police also took copies of all tacho recordings for weeks prior and can issue further tickets if any discrepancy in working hours/speed is found.