Two infrareds beams cross the starting lines and are connected to the Christmas Tree and his electronic clock. When a vehicule cuts the 1^st beam, called pre-stage beam, the pre-stage lamps lights on indicating that the pilot is about 7" from the starting line. The car approach again to cut the stage beam lighting on the 2nd lamp. When the 2 drivers have reached this point, the procedure is automatic and they must be concentrate on the large yellow lamps. In « Pro » catégory  the lamps lights on at the same time, 0.4 second later the green one is on. In « Sportsman » catégory large yellow lamps lights on successively
to the green one after a 0.5 second delay. Pilots are disqualified in case of :
If they reach the stage beam before the green light.
If they cross the white center lanes or if they touch the security wall.
The clock is started at the time when the stage beam is restablished.