Colorado CDL Practice Test

The round black sign on a yellow background at a railroad crossing serves as an advance warning for motorists that they are approaching a railroad track. This sign is designed to alert drivers to the potential presence of an oncoming train, allowing them to prepare to stop or yield as necessary. The use of yellow in the sign's background signifies caution, making it clear that extra attention is required in this area due to the close proximity of train tracks. The design and color of the sign are specifically intended to be easily recognizable to drivers, emphasizing the importance of being vigilant when approaching railroad crossings. Recognizing such warning signs is crucial for ensuring safety on the road, particularly in areas where the intersections of vehicle and train traffic occur.