[en] The radio structures and magnetic fields in the components of the D2 quasars 3C 273, 345 and 454.3 are found to be misaligned by typically 20⁰ with the main axes of the sources. However, the direction of the magnetic field within a given component agrees with the structural elongation of that component. The misalignments in the nuclei of these D2 quasars are in sharp contrast with the situation in the nuclei of D1 sources, which are found to be strictly aligned with the main axis. The 'super-luminal' proper motions in 3C 273 and 345 are in directions closely parallel to the magnetic field vectors in the nuclei of these sources. (author)