What does a yellow sign with "RR" or "X" symbol mean?

The yellow sign featuring "RR" or an "X" symbol is a warning sign indicating that there is a railroad crossing in the vicinity. This means that as a driver approaches the sign, they should be prepared to encounter a train crossing the roadway. The yellow background is used to increase visibility and catch the attention of drivers, alerting them to the potential danger ahead. Understanding this warning is crucial for safety, as trains can approach quickly and are not always visible until they are very close. Drivers should reduce speed, be cautious, and look for any signs that might indicate a train is approaching. Recognizing and responding appropriately to this sign can help prevent accidents at crossings.