We express the risk as the ratio (number of vic-
tims/number of vehicle km) of the transport mode considered. Under the assumptions
made above, we do not need the risk of accidents between each possible combination of
road users, but only an estimate of the accident risk for the occupants of the vehicle and
the risk for pedestrians or cyclists.
For the car accidents, we only take into account the driver victims, because, in
Belgium, insurance covering the car passengers is compulsory, and their accident costs
are thus internalized through the insurance premium. Table 11 gives the risks computed
for Brussels in 2005 for all the modes and accident types considered.