When starting a race from pit exit, when is it appropriate to join the race?

Joining the race from the pit exit should always be done after ensuring that it is safe to do so. The protocol typically involves waiting for the signals at the pit exit, which indicate whether it is safe to merge onto the track. When the lights or flag at the pit exit are green, it means that it is clear for drivers to join the race and that they can do so safely without interfering with other competitors.

This ensures not only the safety of the driver exiting the pits but also the safety of other drivers on the track. It prevents potentially hazardous situations, like joining the race in front of or behind a competing vehicle that may be close to the pit exit. Adhering to this safe merging process after waiting for the appropriate signal is crucial for maintaining order and safety during the race.

The other options suggest actions that either lack safety measures or could disrupt the flow of the race, making them inappropriate.