2.4 SIGNALLING
2.4.1 General
In the supervision of the road, the Clerk of the Course (or his
deputy) and the marshal posts rely largely on the use of signals to
contribute to the drivers’ safety and enforce the regulations.
Signals are given in daylight by different coloured fl ags, which
may be supplemented or replaced by lights.
Black and white signal boards of similar dimensions to the
fl ags may also be used for certain signals: these should be
clearly specifi ed in the Supplementary Regulations of the event
concerned.
At night, the fl ags may be replaced by lights and refl ective
panels, but all drivers must be made aware of this at a briefi ng
beforehand. Yellow lights at each post are obligatory for events
run at night (see Article 2.10.1).
If more than one means of signalling is used, the Supplementary
Regulations of the event must specify which of them is
regulatory.
The start should be controlled from a position close to the start
line, from which the starter can see the complete grid area
between the barriers and which should be visible to all the
drivers, in closed or open cars. It should be protected from debris
coming from the direction of the grid.