Overview of the type II radio burst lanes observed with LOFAR LBA. Top-left panel: Dynamic spectrum in the frequency range 30−88 MHz. Seven different lanes along the radio burst are numbered, and a series of green points indicate the frequency and times of the observations presented in the lower panels. Lanes 1 and 2 show the initial double source structure, while region 3 marks the appearance of a third distinct emission source. These lanes are plotted with the relative EUV running difference emission to put the radio source in context with the driving front. Lower panels: LOFAR radio imaging of lanes 1–6, showing the spatial distribution of each emission feature. In the top row, the contours of the radio sources are color-coded by frequency (see the legend). The contours represent a brightness temperature of 15 MK for lane 1 and 120 MK for lanes 2 and 3. Lanes 4 and 5 show emission with varying spatial distributions. Lane 6 shows emission comparable to the quiet-Sun level. Lanes 7a–c, appearing later in time, represent harmonic emission and are parallel. Lanes 1 and 2 show similar source locations, with double source structures on the western and southern sides of the shock front. Lane 3 shows the moment where the third source starts to appear; the top-right panel shows a zoomed-in view of the spectrum at this moment, with the appearance of other lanes in the spectrum and the presence of a third source in the imaging. Lane 4 shows emission predominantly on the western side, while lane 5 exhibits complex structures in both the western and southern regions. Detailed imaging of the three parallel harmonic lanes 7a–c is presented in Figs. 4 and 5.