b) he uses no more than three cars during
qualifying practice;
c) they are all of the same make and were
entered in the Championship by the same competitor,
d) they have been scrutineered in accordance
with these Sporting Regulations,
e) each car carries its driver's race number.
87) Changes of car may only take place in
the pits under supervision of the marshals.
88) No change of car is permitted after the
commencement of the formation lap unless
the start is delayed or the race stopped
before the leader has completed two laps.
In these cases, no change of car is permitted
after the commencement of the new formation
lap which immediately precedes the start.
GENERAL SAFETY
89) Official instructions will be given to
drivers by means of the signals laid out
in the Code. Competitors must not use flags
similar in any way whatsoever to these.
90) Drivers are strictly forbidden to drive
their car in the opposite direction to the
race unless this is absolutely necessary
in order to move the car from a dangerous
position. A car may only be pushed to remove
it from a dangerous position as directed
by the marshals.
91) Any driver intending to leave the track
or to go to his pit or the paddock area must
signal his intention to do so in good time
making sure that he can do this without danger.
92) During practice and the race, drivers
may use only the track and must at all times
observe the provisions of the Code relating
to driving behaviour on circuits.
93) A driver who abandons a car must leave
it in neutral or with the clutch disengaged
and with the steering wheel in place.
94) Repairs to a car may be carried out only
in the paddock, pits and on the grid.
95) The organiser must make at least two
fire extinguishers of 5 kg capacity available
at each such pit and ensure that they work
properly.