Which races are run in lanes, and what happens on lane infringement or obstruction?

Events run entirely in lanes: 70m, 100m, 200m, 400m, 4 x 100m relay and all hurdles races. The 700m, 1100m and 1500m race walks and the 1500m are not run in lanes.

800m: run in lanes as far as the near edge of the break-line marked after the first bend, where athletes may leave their lanes. Up to two athletes may start in each lane.

Lane infringement: each athlete must stay in their allocated lane for any part of a race run in lanes. On a bend, the athlete must not step or run on or inside the left-hand lane line (or, in the inside lane, the kerb or inside border line). If the Referee is satisfied the rule was infringed and a material advantage was gained, the athlete:

• in Under 9 to Under 11 may be disqualified;
• in Under 12 and above shall be disqualified.

Obstruction: an athlete who jostles or obstructs another so as to impede their progress is liable to disqualification. The Referee may order the race re-held excluding the disqualified athlete, or in heats allow seriously affected athletes to compete in the final. In exceptional circumstances, whether or not anyone is disqualified, the Referee may order a re-run if just and reasonable.

Check marks: athletes may not place check marks on or alongside the track, except as the relay rules allow.

Hurdles must be the collapsible type, so a knocked-down hurdle lays flat with no part protruding.