Final answer:
When you see a yellow, RR sign while driving, it indicates a railroad crossing ahead. Drivers should slow down, be prepared to stop, and look out for approaching trains to ensure safety.
Step-by-step explanation:
When you see a yellow, RR sign while driving, it indicates a railroad crossing ahead. This sign serves as a warning for drivers to slow down, be prepared to stop, and look out for approaching trains. It is important to obey the sign and proceed with caution to ensure safety on the road.