A Raritan Township patrol car spotted smoke coming from the rear of a tractor trailer traveling south on Route 202 and was able to stop the rig just south of Flemington Borough around 4:45 P.M. Heavy fire and a series of explosions confronted firefighters on arrival. The trailer was carrying paints and other flammable materials. Hazmat teams from Hunterdon and Somerset Counties responded. A foam task force was activated and also responded in.