In this study we calculate the private costs, marginal external costs, and degree of internalization for all modes in Flanders for the period 2000-2014, with an outlook towards 2016. The private costs are the costs for the user. For road transport these include the vehicle purchase costs, insurances, maintenance, fuel costs, etc. For transport services (bus, train, plane) this is the ticket price. Marginal external costs are the costs the user does not take into account when deciding to make a trip. They are called marginal as we focus on the additional effect of that one trip. We considered congestion, environment (air pollution and greenhouse gasses), noise, safety, infrastructure wear & tear and health. The internalization of external costs determines the extent to which the user does take into account part of these external costs via taxes and levies. In the case of full internalization, the user pays for all the costs he causes via taxes and levies. Today, in most cases, the user does not pay the ...