  In this paper, we investigate the concept of database supported Vehicular
Dynamic Spectrum Access (VDSA) for platooning. As various researchers show that
the 5.9 GHz band, devoted for Intelligent Transportation Systems, may suffer
from congestion of the channel, we propose to offload part of this traffic to
white-spaces with the guidance of the active database system. In our work, we
describe our measurement campaign which delivered data for population of the
dedicated radio environment map. Once the map is created, it was used in three
proposed algorithms for VDSA: an optimal and two pragmatic approaches.
