The gun targets the rear wheel and the net causes the rear wheel to decelerate gently. Vietnamese police  designed a new Spider Gun-type device to help launch fine fishing nets at errant motorists to snare illegal boy racers on the streets of the northern province of Thanh Hoa.
For years officers have launched fine fishing nets into the paths of runaway bikers, causing their wheels to clog up and their bikes to grind to a halt.