Field tests of a tachograph that has not yet been type-approved allow equipment to be tested in real-life situations before it is widely introduced, thereby allowing faster improvements.
Fágann tástálacha allamuigh ar thacagraf nach bhfuil cineálcheadaithe fós gur féidir an trealamh a thástáil i gcásanna réadúla sula dtugtar isteach go forleathan é, agus féadfar feabhsuithe a dhéanamh níos tapúla dá bhrí sin.