Subcontracting is sometimes a topic of debate due to its importance in transport, the conditions under which it is carried out, and its influence on market prices. In this regard, it is interesting to attempt an analysis of this phenomenon across the entire transport sector, including all modes and activities, even though the activities are often quite different. Such a comparison makes it possible to verify whether or not subcontracting is specific to road transport. From this point of view, the study shows that subcontracting is a general phenomenon throughout the sector, although the rate is particularly high for road transport.