268. Before the official start of the race is given, a driver shall:(1) bring his horse into position behind the starting gate;
(2) place his horse behind the starting gate in its assigned position;
(3) maintain his horse in position behind the starting gate;
(4) prevent his horse from scoring ahead of the starting gate;
(5) drive his horse so as to prevent it from changing position before reaching the starting line;
(6) avoid hindering another driver or another horse behind the starting gate.