A sign with a yellow background and a black T on it is a __________ sign.

The sign with a yellow background and a black T indicates a specific type of warning about an upcoming intersection where the road you are traveling on ends in a T-junction. This is crucial for drivers as it alerts them to prepare for a potential stop or to yield to cross traffic. The yellow color signifies caution, and the T symbol clearly illustrates the type of junction ahead. Therefore, understanding that this sign represents a T-junction helps drivers approach the area with the necessary awareness and readiness to navigate safely.