12a and 12b respectively such as cars when moving along a street lanes 14a and 14b the halon gas 10a and 10b are released through tank actuated valves 11a and 11b through respective nozzles 16a and 16b to create respective gas clouds 18a and 18b the nozzles 16a and 16b can be mounted in road side barricades 20a and 20b respectively when a the vehicles 12 approach the barricades 20 the gas 10 is released through the nozzles 16 to create gas clouds 18 which stop the motor vehicles 12 when entering the clouds 18 external controls lines 22 can be activated by law enforcement officials to actuate the valves 11 to create the gas clouds 18 in u s border and custom enforcement fixed site deployment offers officers a means to stop smugglers and border runners attempting to illegally traverse the u s border border locations typically provide motor vehicles a set predetermined path to follow when crossing the borders at major ports and border crossings runners often attempt to evade u s official through high speed fleeing into the u s from the port and border posts fixed site locations on the u s side of a border or port facility at the exits can.