Controls traffic flow to one direction only designed to cover a full lane width eg 3m width would require 6 flow plates as vehicles pass over the plate the flap is pushed over to allow the vehicle to pass and returns to an upright position after the vehicle passes fitted with rubber buffer to reduce noise heavy duty galvanised steel construction not suitable for hgv use flap h x w 120 x 336mm box w x l x d 300 x 200 x 200mm