Abstract: A gate assembly comprising a gate member pivotally mounted on a frame to be rotatable about a generally horizontal pivot axis at a lower end of the gate member to be pivotable between an upright closed position and a substantially horizontal ground engaging open position, wherein said pivot axis is vertically displaceable on the frame between a lower position and an upper position, a latch member provided on one of the gate member and the frame arranged to engage a receiving recess provided on the other of the gate member and the frame when the pivot axis is in its upper position to secure the gate in its upright position, biasing means being provided for biasing said pivot axis towards its upper position and for biasing the gate member towards its closed position, actuating means being provided for urging said pivot axis of the gate member to its lowered position in response to the action of a vehicle upon said actuating means to release the latch member from the receiving recess to allow the gate member to