What cards are shown for a false start, and what about the Start Information System?

Question

Accepted Answer

Under the World Athletics Technical Rules:

Except in combined events, the athlete(s) responsible for a false start are disqualified, and the starter's assistants raise a red and black (diagonally halved) card in front of them.
In combined events, after a first false start the athlete(s) responsible and all the other athletes in the race are warned with a yellow and black (diagonally halved) card. Anyone responsible for further false starts is disqualified and shown the red and black card.
If a recalled or aborted start is not due to any athlete, no warnings are given and a green card is shown to all the athletes.
The starter should warn or disqualify only the athlete or athletes who, in their opinion, were responsible, which may be more than one.
When a World Athletics certified Start Information System is in use, the starter and/or an assigned recaller wears headphones to hear the signal for a possible false start (reaction time less than 0.100 second). If the gun was fired, there is a recall and the starter immediately examines the reaction times and other information to confirm which athletes are responsible.
The starter or any recaller who thinks a start was not fair (for example blocks slipping or a foreign object interfering) recalls the athletes by firing a gun or activating a suitable audible signal.