Official information is communicated to the drivers by means of radio, telemetry and signalling.
The "signalling area" is located in the pit area. The installations and their attachment must remain flush with the wall (on the track side). The only wording or branding authorised on these installations are the make of the car and/or the name of the team given on the competitor's license. The boards used to inform the drivers may be sliding or pivoting and must not use red, yellow or green colours. They must be shown to the relevant driver only when the car on track passes or is in the proximity of the signalling area.