  Recent studies of interplanetary radio type II bursts and their source
locations are reviewed. As these bursts are due to propagating shock waves,
driven by coronal mass ejections, they can be followed to near-Earth distances
and can be used to predict the arrival times of geo-effective disturbances.
Radio type IV bursts, on the other hand, are usually due to moving magnetic
structures in the low corona and trapped particles form at least part of the
emission. The observed directivity of type IV emission may also be used for
space weather purposes.
