146b underneath the receiving pocket 118 and surrounding each spring 148a 148b and locking pin 144a 144b the anchor also includes weep hole 150a 150b for draining rainwater etc from around the respective springs 148a 148b and locking pins 144a 144b referring now to fig9 when the member 120 is struck by a vehicle it is forced backward thus thrusting the member 120 into one of the detent devices 116a 116b as shown detent device 116b has been impacted when the member 120 impacts the detent device 116b the detent device 116b is pushed back further into receiving pocket 118 as a result the spring 148b is free to thrust the locking pin 144b upward when the locking pin 144b is released it passes through hole 122 in the member 120 and is stopped by plate 114b thus the member 120 precast concrete anchor 110 and receiving pocket 118 are interconnected by the locking pin 144b into an immovable structure the third embodiment however allows for locking of the member 120 regardless of whether the impact comes from either side of the gate i e from a first inbound direction or a second outbound direction because of the presence of the second impact triggered.