be under caution

Since the field was under caution, the consequences were not quite as serious, but he still fell from 1st to 4th.

The race was not stopped immediately, only that section of the straight was under caution, to protect the marshals and firefighters cleaning up the accident.

If the final scheduled lap of the race is under caution, when the green flag is waved for the restart attempt, there are two laps remaining in the race.

In addition the caution need not be explicitly stated if it is obvious that the suspect is already aware of his rights, for example if he is a police officer, as long as the suspect is definitely aware that he is under caution.