Final answer:
After clearing the tracks in an area without caution lights or flags, the next step should be to place caution lights or flags to warn others.
Step-by-step explanation:
After a small group has cleared the tracks in an area unprotected by caution lights or flags, the next step should be to place caution lights or flags to warn others. This is important because caution lights or flags indicate to other individuals that there may still be potential hazards in the area. By placing these warnings, it helps ensure the safety of everyone who may pass through that area.