This article presents an empirical analysis of the prices' structure in the road freight industry. For that purpose, we use the French ECHO survey that provides detailed information on the characteristics of shippers and transport operators. First, we show that road freight prices are not a simple linear function of shipments' attributes. Second, the main determinants of these prices are related to 'technical' attributes of the transport services (load weight, travel duration, distance) but also to the characteristics of the shipped goods (density value, commodities constrains). Lastly, the influence of 'non-traditional' factors (intensity of the shipper-operator relationship, size of the shipper, intra-group shipments) is highlighted.