No. 1. To STOP a vehicle approaching from his front or from either side, the constable faces squarely towards it and extends his right arm and hand at full length above the right shoulder, with the palm of the hand towards the vehicle.
No. 2. To STOP a vehicle approaching from behind, the constable extends his left arm horizontally from the shoulder, and holds it rigid with the back of the hand towards the vehicle.
Nos. 1 and 2 combined. To STOP vehicles approaching from his front and from behind simultaneously the constable combines Signals Nos. 1 and 2 (above).