  This paper considers a very special set of a few interstellar features ---
broad diffuse interstellar bands (DIBs) at 4430, 4882, 5450, 5779 and 6175
\AA\AA. The set is small, and measurements of equivalent widths of these DIBs
are challenging because of severe stellar, interstellar, and sometimes, also
telluric contaminations inside their broad profiles. Nevertheless, we
demonstrate that they do correlate pretty tightly (DIBs 4882 and 5450 to a
lesser extent though) with other narrower diffuse bands, as well as with the
color excess E(B$-$V). The studied broad DIBs correlate well with both
interstellar molecule CH and interstellar K{\sc i}, i.e. it is hardly possible
to verify whether the environments, facilitating the formation of very broad
DIB carriers, are dominated by either molecular or atomic gas as both these
species likely occupy the same volume.
