This field trial is one of many tests that FOA has made in collaboration with the NBC Centre of the Total Defence. The objective was to gather data to set up a risk model for vehicles passing through an area contaminated with chemical warfare agents. The trials were carried out with trialling agents on a wet gravelled road, since these conditions are supposed to give the biggest risk of contamination. Armoured tracked vehicles passed through a contaminated road (1000 m). Surface samples were taken and analysed chemically. The inhalation risk was measured by taking air samples 1 m from the vehicles. The result showed that the uptake on the vehicle was low on surfaces that had not been in contact with the contaminated road. After driving on a clean road for 16.5 km, the contamination of the vehicles was reduced by 75-90 %. The concentration in the air varied from 100 microg/m3 to 650 microg/m3, showing that the inhalation risk is low a short distance from the vehicles.